{
  "dimension": "Commercial & industrial building-stock age/size by state",
  "provider": "Level CFO",
  "note": "Aggregate analysis of public county tax-assessor records: distribution of commercial and industrial building stock by construction era, property type, size, and assessed value per state. A replacement-demand signal for the trades (older stock => more repair/replace work). Aggregate-only; no individual property or owner identified. Deduplicated to one record per parcel (the source is a stacked weekly snapshot history, so a naive row count over-counts ~2.65x); building area bounded to exclude sentinel values.",
  "national": {
    "total_properties": 9084887,
    "era_distribution": [
      {
        "era": "pre-1960",
        "properties": 1675481,
        "pct": 18.4
      },
      {
        "era": "1960-79",
        "properties": 1224848,
        "pct": 13.5
      },
      {
        "era": "1980-99",
        "properties": 1367312,
        "pct": 15.1
      },
      {
        "era": "2000-09",
        "properties": 756810,
        "pct": 8.3
      },
      {
        "era": "2010+",
        "properties": 477451,
        "pct": 5.3
      },
      {
        "era": "unknown",
        "properties": 3582985,
        "pct": 39.4
      }
    ],
    "pre_2000_pct": 77.6,
    "pre_2000_note": "Share of commercial & industrial properties with a known construction era that were built before 2000. Properties with unknown construction era are excluded from this denominator."
  },
  "by_state": [
    {
      "state": "NY",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 42722,
      "avg_sqft": 17631.1,
      "median_value": 405478.8
    },
    {
      "state": "DE",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 890,
      "avg_sqft": 15064.1,
      "median_value": 73200
    },
    {
      "state": "VT",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 59,
      "avg_sqft": 15201.8,
      "median_value": null
    },
    {
      "state": "MD",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 10408,
      "avg_sqft": 21401.4,
      "median_value": 261358.1
    },
    {
      "state": "IN",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 10276,
      "avg_sqft": 15145.6,
      "median_value": 610975.9
    },
    {
      "state": "SC",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 792,
      "avg_sqft": 45706.2,
      "median_value": 545816
    },
    {
      "state": "HI",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 4325,
      "avg_sqft": null,
      "median_value": 230211
    },
    {
      "state": "NJ",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 13327,
      "avg_sqft": 9096,
      "median_value": 574003.6
    },
    {
      "state": "NY",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 11263,
      "avg_sqft": 23436.7,
      "median_value": 583788.4
    },
    {
      "state": "IN",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 8891,
      "avg_sqft": 34490.5,
      "median_value": 380425.1
    },
    {
      "state": "IN",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 10748,
      "avg_sqft": 7991.6,
      "median_value": 11062.2
    },
    {
      "state": "NM",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 300,
      "avg_sqft": 34457.4,
      "median_value": 697511.5
    },
    {
      "state": "RI",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 679,
      "avg_sqft": 26680.9,
      "median_value": null
    },
    {
      "state": "IA",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 8442,
      "avg_sqft": 24883.3,
      "median_value": 634094
    },
    {
      "state": "AR",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 9450,
      "avg_sqft": 9424.3,
      "median_value": 182346.4
    },
    {
      "state": "AZ",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 1570,
      "avg_sqft": 6948.5,
      "median_value": 252681.9
    },
    {
      "state": "WI",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 124269,
      "avg_sqft": 13525.7,
      "median_value": 196308.8
    },
    {
      "state": "AZ",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 5490,
      "avg_sqft": 15161.5,
      "median_value": 98295.8
    },
    {
      "state": "LA",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 9422,
      "avg_sqft": 13447.8,
      "median_value": 235916.6
    },
    {
      "state": "DE",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 7525,
      "avg_sqft": 8661.5,
      "median_value": 57940.2
    },
    {
      "state": "MN",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 2931,
      "avg_sqft": 19609.2,
      "median_value": 506561.7
    },
    {
      "state": "DC",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 6155,
      "avg_sqft": 18045.3,
      "median_value": 1268247.7
    },
    {
      "state": "ME",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 2009,
      "avg_sqft": 12055.7,
      "median_value": null
    },
    {
      "state": "MA",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 39905,
      "avg_sqft": 10902.9,
      "median_value": null
    },
    {
      "state": "WA",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 10612,
      "avg_sqft": 19285,
      "median_value": 1107398.6
    },
    {
      "state": "NE",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 2020,
      "avg_sqft": 12131.2,
      "median_value": 332066.3
    },
    {
      "state": "VA",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 2199,
      "avg_sqft": 24192.3,
      "median_value": 678296.6
    },
    {
      "state": "SC",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 14711,
      "avg_sqft": 4750.1,
      "median_value": 118479.4
    },
    {
      "state": "WI",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 224,
      "avg_sqft": 39071.4,
      "median_value": 1021828.4
    },
    {
      "state": "NE",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 1743,
      "avg_sqft": 12861,
      "median_value": 297931.6
    },
    {
      "state": "RI",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 700,
      "avg_sqft": null,
      "median_value": null
    },
    {
      "state": "NE",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 15534,
      "avg_sqft": 5379.1,
      "median_value": 80832.5
    },
    {
      "state": "CT",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 2776,
      "avg_sqft": 16927.9,
      "median_value": null
    },
    {
      "state": "NE",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 3062,
      "avg_sqft": 12522.6,
      "median_value": 218458.7
    },
    {
      "state": "IL",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 63688,
      "avg_sqft": 9475.5,
      "median_value": 172676.6
    },
    {
      "state": "MO",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 17624,
      "avg_sqft": 8103.8,
      "median_value": 196410.3
    },
    {
      "state": "KY",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 1089,
      "avg_sqft": 29930.1,
      "median_value": 275071.6
    },
    {
      "state": "MA",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 3208,
      "avg_sqft": 33286.2,
      "median_value": null
    },
    {
      "state": "VT",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 1439,
      "avg_sqft": 21094.8,
      "median_value": null
    },
    {
      "state": "PA",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 5780,
      "avg_sqft": 33131.8,
      "median_value": 545203.2
    },
    {
      "state": "CO",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 5788,
      "avg_sqft": 19792.9,
      "median_value": 973508.4
    },
    {
      "state": "OK",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 2852,
      "avg_sqft": 16815.6,
      "median_value": 421111.9
    },
    {
      "state": "SD",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 648,
      "avg_sqft": 14142.3,
      "median_value": null
    },
    {
      "state": "WA",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 23240,
      "avg_sqft": 15488.1,
      "median_value": 821229.5
    },
    {
      "state": "MS",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 2369,
      "avg_sqft": 22437.9,
      "median_value": 153855.7
    },
    {
      "state": "MS",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 1750,
      "avg_sqft": 15134.7,
      "median_value": 25048
    },
    {
      "state": "ND",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 2052,
      "avg_sqft": 19178.5,
      "median_value": 881379.1
    },
    {
      "state": "CT",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 22000,
      "avg_sqft": 6614.9,
      "median_value": null
    },
    {
      "state": "FL",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 29022,
      "avg_sqft": 92166.3,
      "median_value": 26596.5
    },
    {
      "state": "CA",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 36063,
      "avg_sqft": 20281.1,
      "median_value": null
    },
    {
      "state": "MA",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 6224,
      "avg_sqft": 45867.8,
      "median_value": null
    },
    {
      "state": "CT",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 9398,
      "avg_sqft": 12674.8,
      "median_value": null
    },
    {
      "state": "GA",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 52800,
      "avg_sqft": 12366,
      "median_value": 61135.1
    },
    {
      "state": "SD",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 4338,
      "avg_sqft": 5331.1,
      "median_value": 34655
    },
    {
      "state": "MT",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 10445,
      "avg_sqft": 5487.3,
      "median_value": 257917
    },
    {
      "state": "CO",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 20147,
      "avg_sqft": 5335.1,
      "median_value": 549680.3
    },
    {
      "state": "IL",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 9111,
      "avg_sqft": 37308.1,
      "median_value": 255114.5
    },
    {
      "state": "ND",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 957,
      "avg_sqft": 6009.5,
      "median_value": 196775.2
    },
    {
      "state": "VA",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 30185,
      "avg_sqft": 20075.6,
      "median_value": 510656.1
    },
    {
      "state": "SC",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 12092,
      "avg_sqft": 11658.7,
      "median_value": 584320.1
    },
    {
      "state": "GA",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 34528,
      "avg_sqft": 4961.1,
      "median_value": 169810.6
    },
    {
      "state": "OR",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 15795,
      "avg_sqft": 16593.1,
      "median_value": 23924.3
    },
    {
      "state": "NY",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 104675,
      "avg_sqft": 44651.5,
      "median_value": 95168.4
    },
    {
      "state": "LA",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 1182,
      "avg_sqft": 10258.2,
      "median_value": 174088
    },
    {
      "state": "MT",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 13517,
      "avg_sqft": 1269,
      "median_value": 76519.6
    },
    {
      "state": "KS",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 5849,
      "avg_sqft": 14073.1,
      "median_value": 196136.7
    },
    {
      "state": "WV",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 969,
      "avg_sqft": 6532.2,
      "median_value": 223261.8
    },
    {
      "state": "TX",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 75173,
      "avg_sqft": 17162.7,
      "median_value": 653193.1
    },
    {
      "state": "NV",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 1449,
      "avg_sqft": 22032.5,
      "median_value": 605787.4
    },
    {
      "state": "AK",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 7670,
      "avg_sqft": 4352.9,
      "median_value": 147198.2
    },
    {
      "state": "MI",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 199026,
      "avg_sqft": 10350.5,
      "median_value": 99771.3
    },
    {
      "state": "CO",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 7518,
      "avg_sqft": 58235,
      "median_value": 15417.1
    },
    {
      "state": "SC",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 747,
      "avg_sqft": 27721.7,
      "median_value": 114553.7
    },
    {
      "state": "VT",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 173,
      "avg_sqft": 26923.9,
      "median_value": null
    },
    {
      "state": "TX",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 87692,
      "avg_sqft": 11794.1,
      "median_value": 300661.7
    },
    {
      "state": "RI",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 7488,
      "avg_sqft": 3626.7,
      "median_value": null
    },
    {
      "state": "NE",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 8814,
      "avg_sqft": 12169.4,
      "median_value": 340569.5
    },
    {
      "state": "VT",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 8752,
      "avg_sqft": 6133.4,
      "median_value": null
    },
    {
      "state": "WA",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 27590,
      "avg_sqft": 6169.4,
      "median_value": 448432.5
    },
    {
      "state": "WA",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 7295,
      "avg_sqft": 22962,
      "median_value": 1315014.4
    },
    {
      "state": "SC",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 11749,
      "avg_sqft": 8685.5,
      "median_value": 660452.4
    },
    {
      "state": "TX",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 34365,
      "avg_sqft": 49217.2,
      "median_value": 9051.1
    },
    {
      "state": "MA",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 5995,
      "avg_sqft": 32255,
      "median_value": null
    },
    {
      "state": "ID",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 567,
      "avg_sqft": 18386.1,
      "median_value": 885577.2
    },
    {
      "state": "DC",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 1400,
      "avg_sqft": 76808.9,
      "median_value": 3123321.3
    },
    {
      "state": "CO",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 13868,
      "avg_sqft": 15424.5,
      "median_value": 683653.5
    },
    {
      "state": "ID",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 682,
      "avg_sqft": 13519.1,
      "median_value": 451431.2
    },
    {
      "state": "ND",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 629,
      "avg_sqft": 13775.5,
      "median_value": 512426.3
    },
    {
      "state": "SC",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 16571,
      "avg_sqft": 8404.1,
      "median_value": 220330.6
    },
    {
      "state": "WI",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 2021,
      "avg_sqft": 44844.7,
      "median_value": 2139162.7
    },
    {
      "state": "KY",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 67811,
      "avg_sqft": 7084.2,
      "median_value": 97243.6
    },
    {
      "state": "IN",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 31705,
      "avg_sqft": 12261.9,
      "median_value": 144439.6
    },
    {
      "state": "IA",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 6528,
      "avg_sqft": 14946.5,
      "median_value": 981164.3
    },
    {
      "state": "OK",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 2393,
      "avg_sqft": 20727.9,
      "median_value": 529329.5
    },
    {
      "state": "NY",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 29369,
      "avg_sqft": 19539.1,
      "median_value": 54842.1
    },
    {
      "state": "TN",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 26361,
      "avg_sqft": 5789.4,
      "median_value": 137531.5
    },
    {
      "state": "IA",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 7372,
      "avg_sqft": 13069.5,
      "median_value": 243534
    },
    {
      "state": "AL",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 2759,
      "avg_sqft": 12785.1,
      "median_value": 127030.9
    },
    {
      "state": "IN",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 40202,
      "avg_sqft": 8385.2,
      "median_value": 9759.8
    },
    {
      "state": "NH",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 6869,
      "avg_sqft": 9680.1,
      "median_value": null
    },
    {
      "state": "MN",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 19686,
      "avg_sqft": 21100.5,
      "median_value": 334656.5
    },
    {
      "state": "DE",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 509,
      "avg_sqft": 10760,
      "median_value": 88900
    },
    {
      "state": "ID",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 24641,
      "avg_sqft": 5875.5,
      "median_value": 170810.1
    },
    {
      "state": "OH",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 40519,
      "avg_sqft": 13182.7,
      "median_value": 354853.8
    },
    {
      "state": "KY",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 8789,
      "avg_sqft": 12788.2,
      "median_value": 355458.8
    },
    {
      "state": "NJ",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 4774,
      "avg_sqft": 16725.2,
      "median_value": 1070362.5
    },
    {
      "state": "OR",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 15321,
      "avg_sqft": 10428.9,
      "median_value": 592011.9
    },
    {
      "state": "AK",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 2132,
      "avg_sqft": 11059.9,
      "median_value": 483952.1
    },
    {
      "state": "MI",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 12623,
      "avg_sqft": 17427.1,
      "median_value": 670331.3
    },
    {
      "state": "ID",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 4919,
      "avg_sqft": 10700,
      "median_value": 518057.7
    },
    {
      "state": "ID",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 463,
      "avg_sqft": 9094.2,
      "median_value": 271299
    },
    {
      "state": "AL",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 31112,
      "avg_sqft": 7870.5,
      "median_value": 334869.5
    },
    {
      "state": "WI",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 17452,
      "avg_sqft": 7649.4,
      "median_value": 234726
    },
    {
      "state": "GA",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 11396,
      "avg_sqft": 31084.5,
      "median_value": 608858.2
    },
    {
      "state": "NM",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 16048,
      "avg_sqft": 6610,
      "median_value": 106794.8
    },
    {
      "state": "DC",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 18448,
      "avg_sqft": 27473.8,
      "median_value": 30513
    },
    {
      "state": "WI",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 1346,
      "avg_sqft": 29762.1,
      "median_value": 752110.4
    },
    {
      "state": "CO",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 6018,
      "avg_sqft": 12853.2,
      "median_value": 357529.8
    },
    {
      "state": "MO",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 22919,
      "avg_sqft": 11886.4,
      "median_value": 296266.9
    },
    {
      "state": "CA",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 70006,
      "avg_sqft": 24040.6,
      "median_value": null
    },
    {
      "state": "OR",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 2229,
      "avg_sqft": 14256.6,
      "median_value": 864149.5
    },
    {
      "state": "AZ",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 6990,
      "avg_sqft": 20303.3,
      "median_value": 402017.6
    },
    {
      "state": "LA",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 6193,
      "avg_sqft": 11788.7,
      "median_value": 167049.3
    },
    {
      "state": "NC",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 33094,
      "avg_sqft": 8332.5,
      "median_value": 287475.6
    },
    {
      "state": "RI",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 998,
      "avg_sqft": 12821,
      "median_value": null
    },
    {
      "state": "TX",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 121344,
      "avg_sqft": 15974.6,
      "median_value": 398041.7
    },
    {
      "state": "NM",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 1282,
      "avg_sqft": 10192.6,
      "median_value": 290256.5
    },
    {
      "state": "KS",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 4848,
      "avg_sqft": 18676.6,
      "median_value": 962676.4
    },
    {
      "state": "CA",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 36406,
      "avg_sqft": 28771.7,
      "median_value": null
    },
    {
      "state": "ID",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 2357,
      "avg_sqft": 27302.7,
      "median_value": 262016.9
    },
    {
      "state": "PA",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 88298,
      "avg_sqft": 6737.3,
      "median_value": 161588.3
    },
    {
      "state": "ND",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 997,
      "avg_sqft": 23076.1,
      "median_value": 1286620.7
    },
    {
      "state": "OH",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 41760,
      "avg_sqft": 22653.1,
      "median_value": 10917.1
    },
    {
      "state": "WA",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 3467,
      "avg_sqft": 15056.8,
      "median_value": 573636.3
    },
    {
      "state": "VA",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 20641,
      "avg_sqft": 18945.6,
      "median_value": 464635.2
    },
    {
      "state": "AL",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 14661,
      "avg_sqft": 10347.1,
      "median_value": 519930.3
    },
    {
      "state": "DE",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 389,
      "avg_sqft": 8970.5,
      "median_value": 410500
    },
    {
      "state": "MA",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 18599,
      "avg_sqft": 13632.2,
      "median_value": null
    },
    {
      "state": "IA",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 8012,
      "avg_sqft": 15763.2,
      "median_value": 494790
    },
    {
      "state": "ID",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 6085,
      "avg_sqft": 15419.5,
      "median_value": 777277.3
    },
    {
      "state": "NE",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 5183,
      "avg_sqft": 15024.7,
      "median_value": 643152.7
    },
    {
      "state": "NC",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 57946,
      "avg_sqft": 19658.4,
      "median_value": 50486.8
    },
    {
      "state": "ID",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 5584,
      "avg_sqft": 6411.5,
      "median_value": 328533.6
    },
    {
      "state": "SD",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 448,
      "avg_sqft": 14830.2,
      "median_value": null
    },
    {
      "state": "RI",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 643,
      "avg_sqft": 12964.1,
      "median_value": null
    },
    {
      "state": "CT",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 2051,
      "avg_sqft": 24988.1,
      "median_value": null
    },
    {
      "state": "NJ",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 40638,
      "avg_sqft": 6209.9,
      "median_value": 417315
    },
    {
      "state": "UT",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 3126,
      "avg_sqft": 23687.6,
      "median_value": 1361114.7
    },
    {
      "state": "NH",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 8857,
      "avg_sqft": 6688.3,
      "median_value": null
    },
    {
      "state": "NC",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 6930,
      "avg_sqft": 18677.2,
      "median_value": 198474.4
    },
    {
      "state": "CO",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 7630,
      "avg_sqft": 17603.8,
      "median_value": 773289
    },
    {
      "state": "VA",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 4993,
      "avg_sqft": 26816.8,
      "median_value": 694919.3
    },
    {
      "state": "MS",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 14948,
      "avg_sqft": 7687.2,
      "median_value": 203042.4
    },
    {
      "state": "AL",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 2583,
      "avg_sqft": 15558.1,
      "median_value": 78986.1
    },
    {
      "state": "TX",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 18839,
      "avg_sqft": 22896.3,
      "median_value": 598801
    },
    {
      "state": "GA",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 8095,
      "avg_sqft": 37090.4,
      "median_value": 97686.9
    },
    {
      "state": "LA",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 6706,
      "avg_sqft": 9044.1,
      "median_value": 340149.2
    },
    {
      "state": "KS",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 4015,
      "avg_sqft": 9710.7,
      "median_value": 59268.4
    },
    {
      "state": "AK",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 876,
      "avg_sqft": 10943,
      "median_value": 727401.3
    },
    {
      "state": "OH",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 9819,
      "avg_sqft": 21937,
      "median_value": 760033.4
    },
    {
      "state": "CO",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 2684,
      "avg_sqft": 11284.4,
      "median_value": 366915
    },
    {
      "state": "RI",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 86,
      "avg_sqft": 17285.8,
      "median_value": null
    },
    {
      "state": "MA",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 2991,
      "avg_sqft": 36262,
      "median_value": null
    },
    {
      "state": "NH",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 735,
      "avg_sqft": 33050,
      "median_value": null
    },
    {
      "state": "OR",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 3107,
      "avg_sqft": 19651.3,
      "median_value": 1105884.3
    },
    {
      "state": "RI",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 707,
      "avg_sqft": 14932.7,
      "median_value": null
    },
    {
      "state": "FL",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 6901,
      "avg_sqft": 34911.2,
      "median_value": 652872.7
    },
    {
      "state": "WY",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 716,
      "avg_sqft": 9145.2,
      "median_value": 485714.4
    },
    {
      "state": "DE",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 614,
      "avg_sqft": 13344,
      "median_value": 68605.6
    },
    {
      "state": "DE",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 2031,
      "avg_sqft": 12702.7,
      "median_value": 55487.5
    },
    {
      "state": "OH",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 4380,
      "avg_sqft": 33562.8,
      "median_value": 374392.4
    },
    {
      "state": "WV",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 200,
      "avg_sqft": 15670.5,
      "median_value": 184796.4
    },
    {
      "state": "VT",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 1491,
      "avg_sqft": 7696.3,
      "median_value": null
    },
    {
      "state": "NJ",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 54068,
      "avg_sqft": 9364.8,
      "median_value": 376497.2
    },
    {
      "state": "AZ",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 19941,
      "avg_sqft": 8757,
      "median_value": 413350.3
    },
    {
      "state": "NV",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 1144,
      "avg_sqft": 85434.6,
      "median_value": 2554799.4
    },
    {
      "state": "MT",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 3971,
      "avg_sqft": 9479.7,
      "median_value": 704737.2
    },
    {
      "state": "AR",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 3631,
      "avg_sqft": 20327.8,
      "median_value": 222929.7
    },
    {
      "state": "DE",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 93,
      "avg_sqft": 70024.1,
      "median_value": null
    },
    {
      "state": "CT",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 2835,
      "avg_sqft": 18934.2,
      "median_value": null
    },
    {
      "state": "WY",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 2031,
      "avg_sqft": 14489.6,
      "median_value": 612945.1
    },
    {
      "state": "NY",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 2109,
      "avg_sqft": 39984,
      "median_value": 786101.4
    },
    {
      "state": "ME",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 548,
      "avg_sqft": 23545.9,
      "median_value": null
    },
    {
      "state": "FL",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 28170,
      "avg_sqft": 14013.1,
      "median_value": 546734.9
    },
    {
      "state": "TX",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 7186,
      "avg_sqft": 18483.5,
      "median_value": 305380.8
    },
    {
      "state": "MD",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 15861,
      "avg_sqft": 16604.8,
      "median_value": 415614.7
    },
    {
      "state": "OR",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 13616,
      "avg_sqft": 14641.6,
      "median_value": 602842
    },
    {
      "state": "AZ",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 8516,
      "avg_sqft": 37626.4,
      "median_value": 1505455.5
    },
    {
      "state": "MI",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 5439,
      "avg_sqft": 20918.1,
      "median_value": 850059.1
    },
    {
      "state": "MI",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 3048,
      "avg_sqft": 34919.4,
      "median_value": 748163.1
    },
    {
      "state": "TN",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 30362,
      "avg_sqft": 11501.3,
      "median_value": 389384.9
    },
    {
      "state": "MN",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 15247,
      "avg_sqft": 19071.1,
      "median_value": 220868.4
    },
    {
      "state": "VT",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 495,
      "avg_sqft": 15341.6,
      "median_value": null
    },
    {
      "state": "AR",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 7966,
      "avg_sqft": 5665.6,
      "median_value": 100107.7
    },
    {
      "state": "WV",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 3549,
      "avg_sqft": 4272.1,
      "median_value": 97852.5
    },
    {
      "state": "ND",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 265,
      "avg_sqft": 13950.5,
      "median_value": 235673.6
    },
    {
      "state": "NV",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 9250,
      "avg_sqft": 18464.8,
      "median_value": 900379.7
    },
    {
      "state": "NH",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 607,
      "avg_sqft": 17251,
      "median_value": null
    },
    {
      "state": "IA",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 13826,
      "avg_sqft": 9524.5,
      "median_value": 246759.5
    },
    {
      "state": "OK",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 37223,
      "avg_sqft": 5361.6,
      "median_value": 24252.2
    },
    {
      "state": "OR",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 1270,
      "avg_sqft": 31636.4,
      "median_value": 1428219.6
    },
    {
      "state": "WV",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 950,
      "avg_sqft": 5539.4,
      "median_value": 154979.4
    },
    {
      "state": "FL",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 55642,
      "avg_sqft": 10716.9,
      "median_value": 461414.4
    },
    {
      "state": "SC",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 57789,
      "avg_sqft": 6279.7,
      "median_value": 99372.2
    },
    {
      "state": "NE",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 9666,
      "avg_sqft": 8864,
      "median_value": 218214.9
    },
    {
      "state": "NY",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 34267,
      "avg_sqft": 16042.6,
      "median_value": 513743.9
    },
    {
      "state": "PA",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 26857,
      "avg_sqft": 15630.5,
      "median_value": 274975.6
    },
    {
      "state": "OR",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 53389,
      "avg_sqft": 12297.5,
      "median_value": 187250.2
    },
    {
      "state": "MD",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 3473,
      "avg_sqft": 17108.7,
      "median_value": 324667.4
    },
    {
      "state": "WY",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 1190,
      "avg_sqft": 7468.4,
      "median_value": 355480
    },
    {
      "state": "KS",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 2570,
      "avg_sqft": 15473.5,
      "median_value": 228447.7
    },
    {
      "state": "MS",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 5407,
      "avg_sqft": 10026.1,
      "median_value": 416225
    },
    {
      "state": "AR",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 5077,
      "avg_sqft": 12198.6,
      "median_value": 697129.6
    },
    {
      "state": "CO",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 7406,
      "avg_sqft": 28486.2,
      "median_value": 1815896.3
    },
    {
      "state": "MO",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 4914,
      "avg_sqft": 16212.1,
      "median_value": 118001.2
    },
    {
      "state": "VA",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 2327,
      "avg_sqft": 21314.9,
      "median_value": 322107.7
    },
    {
      "state": "CA",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 5190,
      "avg_sqft": 87420.9,
      "median_value": null
    },
    {
      "state": "IN",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 32224,
      "avg_sqft": 12816.1,
      "median_value": 230382.1
    },
    {
      "state": "LA",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 101923,
      "avg_sqft": 9251.6,
      "median_value": 57113.4
    },
    {
      "state": "MI",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 7969,
      "avg_sqft": 32346.3,
      "median_value": 563696.9
    },
    {
      "state": "OH",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 183902,
      "avg_sqft": 7618.4,
      "median_value": 13865.3
    },
    {
      "state": "SC",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 3677,
      "avg_sqft": 19913.5,
      "median_value": 384049.4
    },
    {
      "state": "AZ",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 3831,
      "avg_sqft": 13892.6,
      "median_value": 688256.3
    },
    {
      "state": "KS",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 5477,
      "avg_sqft": 15086.5,
      "median_value": 148279.8
    },
    {
      "state": "TX",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 81317,
      "avg_sqft": 21719.4,
      "median_value": 871030.7
    },
    {
      "state": "NY",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 19805,
      "avg_sqft": 28941.1,
      "median_value": 749467.1
    },
    {
      "state": "UT",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 2402,
      "avg_sqft": 20805.3,
      "median_value": 1084274
    },
    {
      "state": "UT",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 4148,
      "avg_sqft": 104010.6,
      "median_value": 259002.3
    },
    {
      "state": "CA",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 87209,
      "avg_sqft": 19767.9,
      "median_value": null
    },
    {
      "state": "WI",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 1289,
      "avg_sqft": 29462.5,
      "median_value": 528642.7
    },
    {
      "state": "NC",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 6239,
      "avg_sqft": 20653.6,
      "median_value": 494542.9
    },
    {
      "state": "ND",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 1845,
      "avg_sqft": 14267.3,
      "median_value": 524189.1
    },
    {
      "state": "WY",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 6943,
      "avg_sqft": 2362.8,
      "median_value": 66043.6
    },
    {
      "state": "NJ",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 2928,
      "avg_sqft": 26161.5,
      "median_value": 767835.9
    },
    {
      "state": "NM",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 4965,
      "avg_sqft": 12730.6,
      "median_value": 366601.7
    },
    {
      "state": "MN",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 5558,
      "avg_sqft": 31512.2,
      "median_value": 932987
    },
    {
      "state": "NC",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 13397,
      "avg_sqft": 25528.9,
      "median_value": 548431.4
    },
    {
      "state": "HI",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 396,
      "avg_sqft": 18536.5,
      "median_value": 2141647.6
    },
    {
      "state": "TN",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 5188,
      "avg_sqft": 38884.7,
      "median_value": 485254.9
    },
    {
      "state": "LA",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 1234,
      "avg_sqft": 11232.1,
      "median_value": 155441.2
    },
    {
      "state": "HI",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 2897,
      "avg_sqft": 6020,
      "median_value": 1330670.3
    },
    {
      "state": "IA",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 26246,
      "avg_sqft": 5570,
      "median_value": 87128.3
    },
    {
      "state": "AR",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 6301,
      "avg_sqft": 17912.9,
      "median_value": 96156.7
    },
    {
      "state": "OH",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 88329,
      "avg_sqft": 5857.4,
      "median_value": 95190.4
    },
    {
      "state": "OR",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 2634,
      "avg_sqft": 16675.5,
      "median_value": 1024438.1
    },
    {
      "state": "HI",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 5196,
      "avg_sqft": 12212.7,
      "median_value": 1154253
    },
    {
      "state": "SD",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 3396,
      "avg_sqft": 8704.9,
      "median_value": 68520
    },
    {
      "state": "NH",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 467,
      "avg_sqft": 27214.6,
      "median_value": null
    },
    {
      "state": "AR",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 2111,
      "avg_sqft": 17425.4,
      "median_value": 270253.9
    },
    {
      "state": "OH",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 11678,
      "avg_sqft": 28922.7,
      "median_value": 468140.2
    },
    {
      "state": "AK",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 390,
      "avg_sqft": 8598.7,
      "median_value": 532379.8
    },
    {
      "state": "RI",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 3213,
      "avg_sqft": 9659.2,
      "median_value": null
    },
    {
      "state": "AR",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 12713,
      "avg_sqft": 10766.1,
      "median_value": 304582.3
    },
    {
      "state": "FL",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 66751,
      "avg_sqft": 8133.4,
      "median_value": 409533
    },
    {
      "state": "IN",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 43133,
      "avg_sqft": 7786.1,
      "median_value": 85272.5
    },
    {
      "state": "PA",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 29610,
      "avg_sqft": 28714,
      "median_value": 85980.8
    },
    {
      "state": "KY",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 272,
      "avg_sqft": 36033.2,
      "median_value": 499628.1
    },
    {
      "state": "VT",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 122,
      "avg_sqft": 15946.2,
      "median_value": null
    },
    {
      "state": "MI",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 45711,
      "avg_sqft": 7231.1,
      "median_value": 183382
    },
    {
      "state": "ID",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 1021,
      "avg_sqft": 15185.1,
      "median_value": 633334.8
    },
    {
      "state": "AR",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 56685,
      "avg_sqft": 7522.6,
      "median_value": 51161.7
    },
    {
      "state": "IL",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 3069,
      "avg_sqft": 17467.8,
      "median_value": 785605.9
    },
    {
      "state": "VA",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 25986,
      "avg_sqft": 12811.7,
      "median_value": 310418.8
    },
    {
      "state": "WI",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 9591,
      "avg_sqft": 13924.5,
      "median_value": 514255.3
    },
    {
      "state": "AZ",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 34051,
      "avg_sqft": 7615.2,
      "median_value": 76740.4
    },
    {
      "state": "SD",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 3849,
      "avg_sqft": 10101.2,
      "median_value": 69012
    },
    {
      "state": "ND",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 1575,
      "avg_sqft": 8540.9,
      "median_value": 235890.7
    },
    {
      "state": "IL",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 4659,
      "avg_sqft": 39421,
      "median_value": 308865
    },
    {
      "state": "MO",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 8328,
      "avg_sqft": 14835.2,
      "median_value": 628695.3
    },
    {
      "state": "AL",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 3501,
      "avg_sqft": 23964.9,
      "median_value": 303074.8
    },
    {
      "state": "HI",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 1092,
      "avg_sqft": 11989.1,
      "median_value": 1757529.9
    },
    {
      "state": "GA",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 28506,
      "avg_sqft": 13040.3,
      "median_value": 554457.3
    },
    {
      "state": "NV",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 10520,
      "avg_sqft": 6685.7,
      "median_value": 73076.8
    },
    {
      "state": "DE",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 442,
      "avg_sqft": 15160.7,
      "median_value": null
    },
    {
      "state": "IA",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 8249,
      "avg_sqft": 12309.8,
      "median_value": 139589.2
    },
    {
      "state": "PA",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 11578,
      "avg_sqft": 21250.8,
      "median_value": 212916.7
    },
    {
      "state": "ND",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 1183,
      "avg_sqft": 19069.2,
      "median_value": 1124451.5
    },
    {
      "state": "MO",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 28364,
      "avg_sqft": 4679,
      "median_value": 90444.3
    },
    {
      "state": "MD",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 1624,
      "avg_sqft": 33994.2,
      "median_value": 1050081.1
    },
    {
      "state": "NE",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 4398,
      "avg_sqft": 8209.6,
      "median_value": 43793.8
    },
    {
      "state": "UT",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 6072,
      "avg_sqft": 9717.5,
      "median_value": 601693.4
    },
    {
      "state": "MT",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 2569,
      "avg_sqft": null,
      "median_value": 1122.9
    },
    {
      "state": "WA",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 2772,
      "avg_sqft": 26902.7,
      "median_value": 1129385
    },
    {
      "state": "NJ",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 3090,
      "avg_sqft": 31844.5,
      "median_value": 1569806.8
    },
    {
      "state": "PA",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 1692,
      "avg_sqft": 72793,
      "median_value": 664868.4
    },
    {
      "state": "OK",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 9041,
      "avg_sqft": 10765.9,
      "median_value": 539373.8
    },
    {
      "state": "SC",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 1287,
      "avg_sqft": 22222.2,
      "median_value": 448059.5
    },
    {
      "state": "MA",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 54736,
      "avg_sqft": 7770,
      "median_value": null
    },
    {
      "state": "MA",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 1322,
      "avg_sqft": 26964.2,
      "median_value": null
    },
    {
      "state": "NC",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 11246,
      "avg_sqft": 66074.6,
      "median_value": 68430.1
    },
    {
      "state": "PA",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 24950,
      "avg_sqft": 15924.5,
      "median_value": 298339.5
    },
    {
      "state": "AL",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 4438,
      "avg_sqft": 22548.7,
      "median_value": 397855.9
    },
    {
      "state": "ND",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 478,
      "avg_sqft": 11396.1,
      "median_value": 327237.4
    },
    {
      "state": "HI",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 989,
      "avg_sqft": 14611.6,
      "median_value": 2041033.4
    },
    {
      "state": "NH",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 2568,
      "avg_sqft": 13950,
      "median_value": null
    },
    {
      "state": "TN",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 10882,
      "avg_sqft": 19841.6,
      "median_value": 1017628.4
    },
    {
      "state": "TN",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 5987,
      "avg_sqft": 40881.3,
      "median_value": 609909.6
    },
    {
      "state": "ME",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 4135,
      "avg_sqft": 10863,
      "median_value": null
    },
    {
      "state": "MO",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 3836,
      "avg_sqft": 18174.6,
      "median_value": 49281.5
    },
    {
      "state": "CA",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 175142,
      "avg_sqft": 6628.1,
      "median_value": null
    },
    {
      "state": "WI",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 8806,
      "avg_sqft": 14345,
      "median_value": 641007.6
    },
    {
      "state": "CT",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 2212,
      "avg_sqft": 23394.2,
      "median_value": null
    },
    {
      "state": "NV",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 3072,
      "avg_sqft": 28540.6,
      "median_value": 693711.6
    },
    {
      "state": "NY",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 3368,
      "avg_sqft": 22867.6,
      "median_value": 598425.1
    },
    {
      "state": "DE",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 2493,
      "avg_sqft": 4380.1,
      "median_value": 31200
    },
    {
      "state": "NM",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 4900,
      "avg_sqft": 9017.4,
      "median_value": 235135.9
    },
    {
      "state": "MT",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 7653,
      "avg_sqft": 7592.4,
      "median_value": 419115.9
    },
    {
      "state": "PA",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 148711,
      "avg_sqft": 10040.1,
      "median_value": 53628.1
    },
    {
      "state": "VT",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 1930,
      "avg_sqft": 7613.9,
      "median_value": null
    },
    {
      "state": "LA",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 7520,
      "avg_sqft": 12118.5,
      "median_value": 401942.8
    },
    {
      "state": "MN",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 6708,
      "avg_sqft": 36746.3,
      "median_value": 629297.8
    },
    {
      "state": "SC",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 4382,
      "avg_sqft": 25300.8,
      "median_value": 228397.8
    },
    {
      "state": "CA",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 124339,
      "avg_sqft": 14230.9,
      "median_value": null
    },
    {
      "state": "WY",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 3458,
      "avg_sqft": 7611.7,
      "median_value": 335888.7
    },
    {
      "state": "OR",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 14053,
      "avg_sqft": 23498.4,
      "median_value": 326088.8
    },
    {
      "state": "AZ",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 7701,
      "avg_sqft": 18584.4,
      "median_value": 945972.3
    },
    {
      "state": "OK",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 17061,
      "avg_sqft": 8001.8,
      "median_value": 176157.6
    },
    {
      "state": "OH",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 2582,
      "avg_sqft": 71934.9,
      "median_value": 609879.1
    },
    {
      "state": "FL",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 27611,
      "avg_sqft": 19476.8,
      "median_value": 1136640.1
    },
    {
      "state": "NE",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 20980,
      "avg_sqft": 8817.4,
      "median_value": 23483.1
    },
    {
      "state": "GA",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 7468,
      "avg_sqft": 32562.6,
      "median_value": 459958.5
    },
    {
      "state": "OR",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 1683,
      "avg_sqft": 18913.8,
      "median_value": 949007.7
    },
    {
      "state": "SD",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 285,
      "avg_sqft": 11787.2,
      "median_value": null
    },
    {
      "state": "DC",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 6,
      "avg_sqft": 47763,
      "median_value": 8744860
    },
    {
      "state": "MD",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 23045,
      "avg_sqft": 5071.1,
      "median_value": 304650.8
    },
    {
      "state": "NJ",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 1908,
      "avg_sqft": 40228.4,
      "median_value": 1926280.8
    },
    {
      "state": "NM",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 3495,
      "avg_sqft": 5155.6,
      "median_value": 157627.9
    },
    {
      "state": "MT",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 3984,
      "avg_sqft": 11079.6,
      "median_value": 886098.8
    },
    {
      "state": "IL",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 655,
      "avg_sqft": 52262.5,
      "median_value": 443166.4
    },
    {
      "state": "OR",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 20776,
      "avg_sqft": 6247.4,
      "median_value": 448246.1
    },
    {
      "state": "NM",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 1281,
      "avg_sqft": 8661.4,
      "median_value": 194142.4
    },
    {
      "state": "AR",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 1180,
      "avg_sqft": 23350.7,
      "median_value": 322452.5
    },
    {
      "state": "IL",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 39603,
      "avg_sqft": 20450.8,
      "median_value": 188348.6
    },
    {
      "state": "AR",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 2440,
      "avg_sqft": 25803.2,
      "median_value": 157260.4
    },
    {
      "state": "TN",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 880,
      "avg_sqft": 101234.2,
      "median_value": 116211.3
    },
    {
      "state": "IN",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 7081,
      "avg_sqft": 34017.2,
      "median_value": 268395.5
    },
    {
      "state": "RI",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 315,
      "avg_sqft": 12208.9,
      "median_value": null
    },
    {
      "state": "KS",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 5540,
      "avg_sqft": 15953,
      "median_value": 663359.2
    },
    {
      "state": "VA",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 14718,
      "avg_sqft": 18321.6,
      "median_value": 718489
    },
    {
      "state": "TX",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 21837,
      "avg_sqft": 26722.2,
      "median_value": 725522.5
    },
    {
      "state": "NV",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 3288,
      "avg_sqft": 23461.2,
      "median_value": 1531194.9
    },
    {
      "state": "OR",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 5201,
      "avg_sqft": 25243.4,
      "median_value": 1001522.2
    },
    {
      "state": "AZ",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 2857,
      "avg_sqft": 40693.5,
      "median_value": 145219.7
    },
    {
      "state": "TN",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 2389,
      "avg_sqft": 45085.3,
      "median_value": 625262.9
    },
    {
      "state": "NH",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 1872,
      "avg_sqft": 16037.3,
      "median_value": null
    },
    {
      "state": "WY",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 1124,
      "avg_sqft": 12175.9,
      "median_value": 459478.6
    },
    {
      "state": "NM",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 762,
      "avg_sqft": 14975.6,
      "median_value": 537519.4
    },
    {
      "state": "KS",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 24932,
      "avg_sqft": 25124,
      "median_value": 19429.9
    },
    {
      "state": "KS",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 2338,
      "avg_sqft": 30815.8,
      "median_value": 221300
    },
    {
      "state": "ME",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 1302,
      "avg_sqft": 11924.7,
      "median_value": null
    },
    {
      "state": "DC",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 1216,
      "avg_sqft": 86563.4,
      "median_value": 2343194.6
    },
    {
      "state": "AR",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 1524,
      "avg_sqft": 14964.4,
      "median_value": 60798.3
    },
    {
      "state": "FL",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 18775,
      "avg_sqft": 11794.3,
      "median_value": 390509.7
    },
    {
      "state": "HI",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 4531,
      "avg_sqft": 14459.4,
      "median_value": 518831.2
    },
    {
      "state": "UT",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 22212,
      "avg_sqft": 16488.4,
      "median_value": 152728.3
    },
    {
      "state": "MT",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 575,
      "avg_sqft": 7752.5,
      "median_value": 339697.1
    },
    {
      "state": "OK",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 718,
      "avg_sqft": 12163.6,
      "median_value": 419635.9
    },
    {
      "state": "TX",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 75940,
      "avg_sqft": 5886.2,
      "median_value": 174219.9
    },
    {
      "state": "KY",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 15352,
      "avg_sqft": 11248.2,
      "median_value": 266560.3
    },
    {
      "state": "MD",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 14660,
      "avg_sqft": 16830.9,
      "median_value": 341613.7
    },
    {
      "state": "OK",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 19198,
      "avg_sqft": 4607.2,
      "median_value": 94179.5
    },
    {
      "state": "MA",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 6149,
      "avg_sqft": 18936,
      "median_value": null
    },
    {
      "state": "LA",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 11355,
      "avg_sqft": 15161.9,
      "median_value": 80757.9
    },
    {
      "state": "MI",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 27224,
      "avg_sqft": 14542.6,
      "median_value": 362437.7
    },
    {
      "state": "IL",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 43012,
      "avg_sqft": 16313.3,
      "median_value": 207097.7
    },
    {
      "state": "AL",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 1549,
      "avg_sqft": 40906.2,
      "median_value": 851049.7
    },
    {
      "state": "TN",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 24421,
      "avg_sqft": 9779.1,
      "median_value": 249199.4
    },
    {
      "state": "PA",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 6904,
      "avg_sqft": 26298.7,
      "median_value": 753655.4
    },
    {
      "state": "OK",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 6118,
      "avg_sqft": 14501.5,
      "median_value": 299610.6
    },
    {
      "state": "OK",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 5146,
      "avg_sqft": 16408.5,
      "median_value": 266918
    },
    {
      "state": "MO",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 12526,
      "avg_sqft": 14822.7,
      "median_value": 492789.2
    },
    {
      "state": "SC",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 26333,
      "avg_sqft": 10541,
      "median_value": 347926
    },
    {
      "state": "WI",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 466,
      "avg_sqft": 28919,
      "median_value": 745677.9
    },
    {
      "state": "WY",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 1025,
      "avg_sqft": 10500,
      "median_value": 85370.8
    },
    {
      "state": "GA",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 32510,
      "avg_sqft": 9678.7,
      "median_value": 270490.8
    },
    {
      "state": "VT",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 352,
      "avg_sqft": 18492.8,
      "median_value": null
    },
    {
      "state": "OK",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 3696,
      "avg_sqft": 9159.4,
      "median_value": 106135
    },
    {
      "state": "FL",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 7452,
      "avg_sqft": 11918.3,
      "median_value": 485171.1
    },
    {
      "state": "CT",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 4268,
      "avg_sqft": 24159.2,
      "median_value": null
    },
    {
      "state": "NJ",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 595,
      "avg_sqft": 38835,
      "median_value": 2224554.5
    },
    {
      "state": "MI",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 8583,
      "avg_sqft": 34719.6,
      "median_value": 857273.3
    },
    {
      "state": "KS",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 11372,
      "avg_sqft": 12999.6,
      "median_value": 396454.9
    },
    {
      "state": "MS",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 13569,
      "avg_sqft": 6244.3,
      "median_value": 113460.1
    },
    {
      "state": "CO",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 3990,
      "avg_sqft": 25007.5,
      "median_value": 445915
    },
    {
      "state": "FL",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 84164,
      "avg_sqft": 12089.4,
      "median_value": 496480.5
    },
    {
      "state": "LA",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 9141,
      "avg_sqft": 8785.7,
      "median_value": 274461
    },
    {
      "state": "CO",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 21819,
      "avg_sqft": 16278.7,
      "median_value": 611990.6
    },
    {
      "state": "IL",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 10989,
      "avg_sqft": 37001.4,
      "median_value": 436432.5
    },
    {
      "state": "DE",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 161,
      "avg_sqft": 30425.3,
      "median_value": null
    },
    {
      "state": "WA",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 4790,
      "avg_sqft": 19221.1,
      "median_value": 933452.7
    },
    {
      "state": "AL",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 65985,
      "avg_sqft": 7702.5,
      "median_value": 15474.5
    },
    {
      "state": "DC",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 652,
      "avg_sqft": 119607.8,
      "median_value": 4792397.7
    },
    {
      "state": "MS",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 678,
      "avg_sqft": 48389.7,
      "median_value": 351476.4
    },
    {
      "state": "AL",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 10534,
      "avg_sqft": 9880.1,
      "median_value": 710066.3
    },
    {
      "state": "KY",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 758,
      "avg_sqft": 51636.5,
      "median_value": 656936.9
    },
    {
      "state": "NV",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 3526,
      "avg_sqft": 27296.3,
      "median_value": 749436.1
    },
    {
      "state": "NY",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 20454,
      "avg_sqft": 18951.6,
      "median_value": 481493.9
    },
    {
      "state": "PA",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 9812,
      "avg_sqft": 21289.1,
      "median_value": 445462.3
    },
    {
      "state": "MN",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 15983,
      "avg_sqft": 18920.7,
      "median_value": 381069.9
    },
    {
      "state": "MN",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 2053,
      "avg_sqft": 25305.3,
      "median_value": 464089.8
    },
    {
      "state": "MT",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 307,
      "avg_sqft": 15638.5,
      "median_value": 594744.9
    },
    {
      "state": "MS",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 1025,
      "avg_sqft": 14513.6,
      "median_value": 71197.6
    },
    {
      "state": "DC",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 35,
      "avg_sqft": 15255.9,
      "median_value": 1549940
    },
    {
      "state": "ME",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 11345,
      "avg_sqft": 5660.1,
      "median_value": null
    },
    {
      "state": "GA",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 5610,
      "avg_sqft": 37689.2,
      "median_value": 656125.6
    },
    {
      "state": "AK",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 4989,
      "avg_sqft": 8640.8,
      "median_value": 473998
    },
    {
      "state": "ID",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 5620,
      "avg_sqft": 10887.4,
      "median_value": 743990.7
    },
    {
      "state": "AR",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 8210,
      "avg_sqft": 12904.2,
      "median_value": 519451
    },
    {
      "state": "CO",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 28244,
      "avg_sqft": 20190.1,
      "median_value": 21154.6
    },
    {
      "state": "DC",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 82,
      "avg_sqft": 18416.9,
      "median_value": 1420230
    },
    {
      "state": "ME",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 316,
      "avg_sqft": 29651.3,
      "median_value": null
    },
    {
      "state": "VA",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 69307,
      "avg_sqft": 18865.9,
      "median_value": 87272.4
    },
    {
      "state": "SD",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 360,
      "avg_sqft": 14661.3,
      "median_value": null
    },
    {
      "state": "VT",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 219,
      "avg_sqft": 13947.3,
      "median_value": null
    },
    {
      "state": "MD",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 8144,
      "avg_sqft": 19053.9,
      "median_value": 121046.2
    },
    {
      "state": "WY",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 3561,
      "avg_sqft": 13386.8,
      "median_value": 323588.3
    },
    {
      "state": "NJ",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 8134,
      "avg_sqft": 50422.2,
      "median_value": 885357.1
    },
    {
      "state": "WV",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 414,
      "avg_sqft": 7835.8,
      "median_value": 123901.1
    },
    {
      "state": "VA",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 5443,
      "avg_sqft": 19373.1,
      "median_value": 68348.4
    },
    {
      "state": "WV",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 5,
      "avg_sqft": 1483,
      "median_value": 181400
    },
    {
      "state": "NV",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 4830,
      "avg_sqft": 4444.8,
      "median_value": 205064.4
    },
    {
      "state": "AZ",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 25128,
      "avg_sqft": 19193.1,
      "median_value": 507254.5
    },
    {
      "state": "MI",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 7296,
      "avg_sqft": 30182.3,
      "median_value": 252072.4
    },
    {
      "state": "KS",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 6555,
      "avg_sqft": 114706.2,
      "median_value": 18155.1
    },
    {
      "state": "NV",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 435,
      "avg_sqft": 7701.3,
      "median_value": 282698.3
    },
    {
      "state": "CA",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 15585,
      "avg_sqft": 32241.7,
      "median_value": null
    },
    {
      "state": "OK",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 18388,
      "avg_sqft": 9494.6,
      "median_value": 269962.5
    },
    {
      "state": "KY",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 3344,
      "avg_sqft": 11913.6,
      "median_value": 487443.5
    },
    {
      "state": "WA",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 5818,
      "avg_sqft": 24947.1,
      "median_value": 1265749.2
    },
    {
      "state": "AL",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 2194,
      "avg_sqft": 28061.5,
      "median_value": 530600
    },
    {
      "state": "WI",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 4339,
      "avg_sqft": 24375.9,
      "median_value": 1010239.7
    },
    {
      "state": "MA",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 4626,
      "avg_sqft": 27892,
      "median_value": null
    },
    {
      "state": "MD",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 3309,
      "avg_sqft": 26611.6,
      "median_value": 948804.8
    },
    {
      "state": "HI",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 6659,
      "avg_sqft": 2084.8,
      "median_value": 293715
    },
    {
      "state": "GA",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 3187,
      "avg_sqft": 71595,
      "median_value": 886874
    },
    {
      "state": "IN",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 3084,
      "avg_sqft": 54970.2,
      "median_value": 760358.8
    },
    {
      "state": "IA",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 5288,
      "avg_sqft": 10331.5,
      "median_value": 193310.1
    },
    {
      "state": "DC",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 264,
      "avg_sqft": 22646.7,
      "median_value": 1860966.7
    },
    {
      "state": "IL",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 12922,
      "avg_sqft": 32522.1,
      "median_value": 375743.4
    },
    {
      "state": "KY",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 13275,
      "avg_sqft": 6717.7,
      "median_value": 165627.6
    },
    {
      "state": "GA",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 45551,
      "avg_sqft": 12721.8,
      "median_value": 446704.4
    },
    {
      "state": "ID",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 4086,
      "avg_sqft": 15408.3,
      "median_value": 969856.8
    },
    {
      "state": "CO",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 20120,
      "avg_sqft": 10451.5,
      "median_value": 649233.1
    },
    {
      "state": "ID",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 751,
      "avg_sqft": 12818.1,
      "median_value": 771830.4
    },
    {
      "state": "VA",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 3286,
      "avg_sqft": 28563.5,
      "median_value": 661447.2
    },
    {
      "state": "CA",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 192601,
      "avg_sqft": 11649.6,
      "median_value": null
    },
    {
      "state": "AK",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 5024,
      "avg_sqft": 9257.2,
      "median_value": 437926.7
    },
    {
      "state": "NM",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 1694,
      "avg_sqft": 12296.3,
      "median_value": 792955.7
    },
    {
      "state": "MN",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 4445,
      "avg_sqft": 39563.6,
      "median_value": 779941.1
    },
    {
      "state": "WA",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 21006,
      "avg_sqft": 9675.7,
      "median_value": 656592.1
    },
    {
      "state": "CA",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 25771,
      "avg_sqft": 16613,
      "median_value": null
    },
    {
      "state": "KY",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 10960,
      "avg_sqft": 10561.2,
      "median_value": 214831.3
    },
    {
      "state": "IN",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 3861,
      "avg_sqft": 44550.9,
      "median_value": 444637.5
    },
    {
      "state": "NM",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 1564,
      "avg_sqft": 14767.5,
      "median_value": 422598.9
    },
    {
      "state": "IA",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 6188,
      "avg_sqft": 9440.6,
      "median_value": 51481
    },
    {
      "state": "FL",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 97470,
      "avg_sqft": 14761.5,
      "median_value": 59597.1
    },
    {
      "state": "FL",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 57707,
      "avg_sqft": 4680.7,
      "median_value": 334430
    },
    {
      "state": "ME",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 244,
      "avg_sqft": 18310.5,
      "median_value": null
    },
    {
      "state": "RI",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 7632,
      "avg_sqft": 5345.1,
      "median_value": null
    },
    {
      "state": "CT",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 2379,
      "avg_sqft": 29246.2,
      "median_value": null
    },
    {
      "state": "WY",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 1202,
      "avg_sqft": 12520.3,
      "median_value": 360603.4
    },
    {
      "state": "AK",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 1844,
      "avg_sqft": 10757.2,
      "median_value": 528209.9
    },
    {
      "state": "AK",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 1518,
      "avg_sqft": 5656.6,
      "median_value": 335517.3
    },
    {
      "state": "LA",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 1955,
      "avg_sqft": 12642.4,
      "median_value": 153201.5
    },
    {
      "state": "MT",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 551,
      "avg_sqft": 12266.7,
      "median_value": 699936.5
    },
    {
      "state": "ME",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 3227,
      "avg_sqft": 9984.4,
      "median_value": null
    },
    {
      "state": "KY",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 1366,
      "avg_sqft": 32553.2,
      "median_value": 437649.5
    },
    {
      "state": "MD",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 31960,
      "avg_sqft": 7873.6,
      "median_value": 119737.5
    },
    {
      "state": "UT",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 859,
      "avg_sqft": 17532.3,
      "median_value": 727679.5
    },
    {
      "state": "NH",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 1635,
      "avg_sqft": 15350.1,
      "median_value": null
    },
    {
      "state": "TN",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 34882,
      "avg_sqft": 6120,
      "median_value": 62104.8
    },
    {
      "state": "MN",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 23122,
      "avg_sqft": 11045.1,
      "median_value": 208519.1
    },
    {
      "state": "MS",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 1267,
      "avg_sqft": 28884,
      "median_value": 257055.2
    },
    {
      "state": "OH",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 49064,
      "avg_sqft": 11108.9,
      "median_value": 217456.1
    },
    {
      "state": "IL",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 29009,
      "avg_sqft": 55411.2,
      "median_value": 81674.6
    },
    {
      "state": "CA",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 34113,
      "avg_sqft": 24169.5,
      "median_value": null
    },
    {
      "state": "TN",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 1551,
      "avg_sqft": 80387.1,
      "median_value": 1159303.6
    },
    {
      "state": "NE",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 5083,
      "avg_sqft": 13941.2,
      "median_value": 482419.2
    },
    {
      "state": "NJ",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 2190,
      "avg_sqft": 9974.7,
      "median_value": 1054733.4
    },
    {
      "state": "NV",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 9298,
      "avg_sqft": 12364.1,
      "median_value": 153604.6
    },
    {
      "state": "IN",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 5613,
      "avg_sqft": 32759.4,
      "median_value": 142197.4
    },
    {
      "state": "AK",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 715,
      "avg_sqft": 13755.1,
      "median_value": 958264.1
    },
    {
      "state": "CT",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 972,
      "avg_sqft": 18146.4,
      "median_value": null
    },
    {
      "state": "NM",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 606,
      "avg_sqft": 8229,
      "median_value": 214616.9
    },
    {
      "state": "DC",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 15,
      "avg_sqft": 96741,
      "median_value": 14404680
    },
    {
      "state": "ND",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 456,
      "avg_sqft": 21202.1,
      "median_value": 508324.3
    },
    {
      "state": "SC",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 1639,
      "avg_sqft": 24687.2,
      "median_value": 266279.8
    },
    {
      "state": "AL",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 36621,
      "avg_sqft": 3391.2,
      "median_value": 58965
    },
    {
      "state": "MD",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 4085,
      "avg_sqft": 27878.8,
      "median_value": 929175
    },
    {
      "state": "SD",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 2029,
      "avg_sqft": 11335.9,
      "median_value": 118020
    },
    {
      "state": "KS",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 12440,
      "avg_sqft": 9492.7,
      "median_value": 207951.5
    },
    {
      "state": "MO",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 3774,
      "avg_sqft": 17998,
      "median_value": 221298.3
    },
    {
      "state": "CT",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 19490,
      "avg_sqft": 6792.7,
      "median_value": null
    },
    {
      "state": "UT",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 6713,
      "avg_sqft": 21012.8,
      "median_value": 1342963
    },
    {
      "state": "MT",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 702,
      "avg_sqft": 9128.1,
      "median_value": 475377.1
    },
    {
      "state": "NJ",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 244,
      "avg_sqft": 62129.5,
      "median_value": 5175654
    },
    {
      "state": "ME",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 7545,
      "avg_sqft": 6724.6,
      "median_value": null
    },
    {
      "state": "HI",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 970,
      "avg_sqft": 17326.4,
      "median_value": 2448721.9
    },
    {
      "state": "NJ",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 10427,
      "avg_sqft": 11944.2,
      "median_value": 609681.5
    },
    {
      "state": "NC",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 25370,
      "avg_sqft": 11945.9,
      "median_value": 651747.5
    },
    {
      "state": "RI",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 910,
      "avg_sqft": 29354.9,
      "median_value": null
    },
    {
      "state": "WY",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 1462,
      "avg_sqft": 10556,
      "median_value": 808972.5
    },
    {
      "state": "HI",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 1084,
      "avg_sqft": 13987.8,
      "median_value": 2643782.2
    },
    {
      "state": "MN",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 2814,
      "avg_sqft": 30867,
      "median_value": 393800.5
    },
    {
      "state": "DE",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 1755,
      "avg_sqft": 9975.5,
      "median_value": 41700
    },
    {
      "state": "MS",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 11826,
      "avg_sqft": 3847.2,
      "median_value": 64078.2
    },
    {
      "state": "OH",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 17442,
      "avg_sqft": 15705.5,
      "median_value": 529321.8
    },
    {
      "state": "ND",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 231,
      "avg_sqft": 7062.7,
      "median_value": 61133.1
    },
    {
      "state": "WY",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 4058,
      "avg_sqft": 4810.2,
      "median_value": 259070.4
    },
    {
      "state": "NV",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 12765,
      "avg_sqft": 17600.3,
      "median_value": 423310.8
    },
    {
      "state": "SD",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 24028,
      "avg_sqft": 10177.4,
      "median_value": 18461.8
    },
    {
      "state": "NC",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 9051,
      "avg_sqft": 30559.1,
      "median_value": 453730.7
    },
    {
      "state": "NH",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 214,
      "avg_sqft": 30688.5,
      "median_value": null
    },
    {
      "state": "OH",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 11224,
      "avg_sqft": 25640.6,
      "median_value": 323956.1
    },
    {
      "state": "LA",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 1540,
      "avg_sqft": 11289.6,
      "median_value": 120427.9
    },
    {
      "state": "WY",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 526,
      "avg_sqft": 6744.1,
      "median_value": 188805.5
    },
    {
      "state": "IL",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 159778,
      "avg_sqft": 8617,
      "median_value": 71164.1
    },
    {
      "state": "MO",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 65572,
      "avg_sqft": 18315,
      "median_value": 44332.8
    },
    {
      "state": "FL",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 17272,
      "avg_sqft": 14709.9,
      "median_value": 713256.5
    },
    {
      "state": "VT",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 4546,
      "avg_sqft": 5181.4,
      "median_value": null
    },
    {
      "state": "NC",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 39737,
      "avg_sqft": 5305.5,
      "median_value": 174616.1
    },
    {
      "state": "DC",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 423,
      "avg_sqft": 109153.5,
      "median_value": 4858798.2
    },
    {
      "state": "WV",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 9696,
      "avg_sqft": 4798.3,
      "median_value": 108534.2
    },
    {
      "state": "SD",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 567,
      "avg_sqft": 18783.3,
      "median_value": null
    },
    {
      "state": "WV",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 88,
      "avg_sqft": 1914.6,
      "median_value": 173400
    },
    {
      "state": "WV",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 51,
      "avg_sqft": 28302.7,
      "median_value": 234300
    },
    {
      "state": "NY",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 16940,
      "avg_sqft": 20506.8,
      "median_value": 466694.8
    },
    {
      "state": "AK",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 1327,
      "avg_sqft": 9457.9,
      "median_value": 92172.7
    },
    {
      "state": "NH",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 4247,
      "avg_sqft": 8983,
      "median_value": null
    },
    {
      "state": "TN",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 3611,
      "avg_sqft": 24765.7,
      "median_value": 182223.2
    },
    {
      "state": "ME",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 1497,
      "avg_sqft": 19605.4,
      "median_value": null
    },
    {
      "state": "VA",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 6585,
      "avg_sqft": 28518.7,
      "median_value": 1562318.9
    },
    {
      "state": "MD",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 4238,
      "avg_sqft": 32361.5,
      "median_value": 1926764
    },
    {
      "state": "IN",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 15167,
      "avg_sqft": 15161.6,
      "median_value": 423749.6
    },
    {
      "state": "MO",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 2506,
      "avg_sqft": 18800.6,
      "median_value": 323277.1
    },
    {
      "state": "WI",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 9074,
      "avg_sqft": 17805.9,
      "median_value": 696391.6
    },
    {
      "state": "NH",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 9498,
      "avg_sqft": 5874.5,
      "median_value": null
    },
    {
      "state": "MI",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 37981,
      "avg_sqft": 34420.8,
      "median_value": 93668.3
    },
    {
      "state": "NM",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 2656,
      "avg_sqft": 12439.7,
      "median_value": 508114.2
    },
    {
      "state": "ND",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 71518,
      "avg_sqft": 8488.4,
      "median_value": 13055.9
    },
    {
      "state": "ME",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 177,
      "avg_sqft": 12130.8,
      "median_value": null
    },
    {
      "state": "MN",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 13155,
      "avg_sqft": 19056.1,
      "median_value": 40856.7
    },
    {
      "state": "IA",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 11959,
      "avg_sqft": 11858.8,
      "median_value": 379928.2
    },
    {
      "state": "WV",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 205,
      "avg_sqft": 3670.3,
      "median_value": 262040
    },
    {
      "state": "ME",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 356,
      "avg_sqft": 30058.2,
      "median_value": null
    },
    {
      "state": "WA",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 14834,
      "avg_sqft": 19844.5,
      "median_value": 21189
    },
    {
      "state": "VA",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 792,
      "avg_sqft": 59965.9,
      "median_value": 2781798.3
    },
    {
      "state": "AK",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 497,
      "avg_sqft": 6950.3,
      "median_value": 287358.7
    },
    {
      "state": "UT",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 2133,
      "avg_sqft": 20708.2,
      "median_value": 925967.7
    },
    {
      "state": "PA",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 2094,
      "avg_sqft": 49702.2,
      "median_value": 645516.9
    },
    {
      "state": "DC",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 20,
      "avg_sqft": 71663.5,
      "median_value": 6549160
    },
    {
      "state": "RI",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 3320,
      "avg_sqft": 8849.7,
      "median_value": null
    },
    {
      "state": "CT",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 8964,
      "avg_sqft": 14359.4,
      "median_value": null
    },
    {
      "state": "MD",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 856,
      "avg_sqft": 90481.6,
      "median_value": 3166825.9
    },
    {
      "state": "NY",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 8769,
      "avg_sqft": 21495.3,
      "median_value": 610737.6
    },
    {
      "state": "TN",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 17003,
      "avg_sqft": 12540.9,
      "median_value": 495768.3
    },
    {
      "state": "KY",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 3649,
      "avg_sqft": 19786.8,
      "median_value": 76669.7
    },
    {
      "state": "MA",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 795,
      "avg_sqft": 52190.3,
      "median_value": null
    },
    {
      "state": "MA",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 17585,
      "avg_sqft": 14199.6,
      "median_value": null
    },
    {
      "state": "MI",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 2058,
      "avg_sqft": 46758.8,
      "median_value": 764746.6
    },
    {
      "state": "MO",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 5167,
      "avg_sqft": 17776,
      "median_value": 276727
    },
    {
      "state": "WV",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 169,
      "avg_sqft": 26266.4,
      "median_value": 155157.1
    },
    {
      "state": "VT",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 724,
      "avg_sqft": 9302.6,
      "median_value": null
    },
    {
      "state": "NY",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 166127,
      "avg_sqft": 11512,
      "median_value": 788020.9
    },
    {
      "state": "AK",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 92,
      "avg_sqft": 9305.3,
      "median_value": 709300
    },
    {
      "state": "MS",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 7709,
      "avg_sqft": 10875.3,
      "median_value": 352908.4
    },
    {
      "state": "UT",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 7628,
      "avg_sqft": 13766.3,
      "median_value": 825672.5
    },
    {
      "state": "NC",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 46895,
      "avg_sqft": 10725.3,
      "median_value": 429228.5
    },
    {
      "state": "WV",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 61072,
      "avg_sqft": 6849.9,
      "median_value": 58861.1
    },
    {
      "state": "NE",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 1657,
      "avg_sqft": 7064.9,
      "median_value": 47877.4
    },
    {
      "state": "NC",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 3480,
      "avg_sqft": 40890.9,
      "median_value": 819414.6
    },
    {
      "state": "MT",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 187,
      "avg_sqft": 14587.8,
      "median_value": 316450
    },
    {
      "state": "UT",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 12320,
      "avg_sqft": 13802.4,
      "median_value": 549167.5
    },
    {
      "state": "UT",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 1685,
      "avg_sqft": 46137.6,
      "median_value": 1894545
    },
    {
      "state": "SD",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 510,
      "avg_sqft": 12348.3,
      "median_value": null
    },
    {
      "state": "MT",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 6469,
      "avg_sqft": 8339.4,
      "median_value": 542508.7
    },
    {
      "state": "TX",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 12863,
      "avg_sqft": 51267.6,
      "median_value": 1078308.6
    },
    {
      "state": "AZ",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 11941,
      "avg_sqft": 4220.4,
      "median_value": 272923.2
    },
    {
      "state": "NH",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 1060,
      "avg_sqft": 768,
      "median_value": null
    },
    {
      "state": "MN",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 55530,
      "avg_sqft": 7695.8,
      "median_value": 48541
    },
    {
      "state": "IA",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 8758,
      "avg_sqft": 11654.8,
      "median_value": 177441.3
    },
    {
      "state": "MS",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 9775,
      "avg_sqft": 5206.7,
      "median_value": 25112.5
    },
    {
      "state": "WA",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 38429,
      "avg_sqft": 7651.1,
      "median_value": 98829.6
    },
    {
      "state": "WI",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 1545,
      "avg_sqft": 30209.5,
      "median_value": 282168.3
    },
    {
      "state": "GA",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 4135,
      "avg_sqft": 15903,
      "median_value": 115051.1
    },
    {
      "state": "PA",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 6665,
      "avg_sqft": 29497.7,
      "median_value": 485246.2
    },
    {
      "state": "MS",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 2823,
      "avg_sqft": 20469.6,
      "median_value": 204195.1
    },
    {
      "state": "DE",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 675,
      "avg_sqft": 19545.5,
      "median_value": 176000
    },
    {
      "state": "HI",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 259,
      "avg_sqft": 19552,
      "median_value": 3513428.6
    },
    {
      "state": "OK",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 7718,
      "avg_sqft": 10697.1,
      "median_value": 725222.2
    },
    {
      "state": "KY",
      "era": "1980-99",
      "use_group": "Industrial",
      "properties": 2189,
      "avg_sqft": 37220.6,
      "median_value": 596479.5
    },
    {
      "state": "IA",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 75700,
      "avg_sqft": 20660.9,
      "median_value": 15346.3
    },
    {
      "state": "CA",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 19230,
      "avg_sqft": 31065.6,
      "median_value": null
    },
    {
      "state": "KS",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 22577,
      "avg_sqft": 4731.6,
      "median_value": 65848.5
    },
    {
      "state": "IL",
      "era": "2000-09",
      "use_group": "Commercial",
      "properties": 31665,
      "avg_sqft": 13361.8,
      "median_value": 59906.6
    },
    {
      "state": "HI",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 807,
      "avg_sqft": 9172.8,
      "median_value": 636437.5
    },
    {
      "state": "MO",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 1576,
      "avg_sqft": 31271.6,
      "median_value": 359131
    },
    {
      "state": "CT",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 406,
      "avg_sqft": 34502.7,
      "median_value": null
    },
    {
      "state": "GA",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 12862,
      "avg_sqft": 21793.7,
      "median_value": 1061399.6
    },
    {
      "state": "AZ",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 31559,
      "avg_sqft": 18192.1,
      "median_value": 504892
    },
    {
      "state": "NC",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 13519,
      "avg_sqft": 18525.3,
      "median_value": 1330722.6
    },
    {
      "state": "WA",
      "era": "2010+",
      "use_group": "Industrial",
      "properties": 2141,
      "avg_sqft": 38028.7,
      "median_value": 1425448.6
    },
    {
      "state": "AL",
      "era": "1960-79",
      "use_group": "Commercial",
      "properties": 24769,
      "avg_sqft": 6969.6,
      "median_value": 216381
    },
    {
      "state": "TX",
      "era": "2000-09",
      "use_group": "Industrial",
      "properties": 10836,
      "avg_sqft": 32758.8,
      "median_value": 894747.7
    },
    {
      "state": "NV",
      "era": "unknown",
      "use_group": "Industrial",
      "properties": 9571,
      "avg_sqft": 199341.1,
      "median_value": 12610
    },
    {
      "state": "MI",
      "era": "1980-99",
      "use_group": "Commercial",
      "properties": 24430,
      "avg_sqft": 18073.9,
      "median_value": 565868.7
    },
    {
      "state": "LA",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 1439,
      "avg_sqft": 8042.8,
      "median_value": 105183.1
    },
    {
      "state": "OH",
      "era": "pre-1960",
      "use_group": "Industrial",
      "properties": 17705,
      "avg_sqft": 18044.4,
      "median_value": 115183.9
    },
    {
      "state": "NE",
      "era": "1960-79",
      "use_group": "Industrial",
      "properties": 2879,
      "avg_sqft": 16935.9,
      "median_value": 186483.1
    },
    {
      "state": "TX",
      "era": "unknown",
      "use_group": "Commercial",
      "properties": 329007,
      "avg_sqft": 8235.9,
      "median_value": 17259.8
    },
    {
      "state": "UT",
      "era": "pre-1960",
      "use_group": "Commercial",
      "properties": 6647,
      "avg_sqft": 5811.8,
      "median_value": 472755.1
    },
    {
      "state": "SD",
      "era": "2010+",
      "use_group": "Commercial",
      "properties": 1522,
      "avg_sqft": 11071.5,
      "median_value": 274861
    }
  ],
  "source": "Public state and county tax-assessor and property records (aggregated). Aggregate-only; no individual property or owner identified.",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": {
    "required": true,
    "text": "Source: TradesIndex by Level",
    "url": "https://tradesindex.org",
    "digital_use": "Include a clickable link to https://tradesindex.org when republishing this analysis or compilation online."
  },
  "methodology": {
    "record_origin": "Underlying records originate in public state and county tax-assessor and property-record systems.",
    "access_path": "Level analyzed an aggregated compilation of those public records. This dataset does not claim that Level downloaded every record directly from each government website.",
    "analysis_date": "2026-07-23",
    "geographic_coverage": "51 state-level jurisdictions, including the District of Columbia",
    "published_grain": "One aggregate cell per state, construction-era band, and commercial or industrial use group.",
    "unit_warning": "Properties are deduplicated assessor parcels or property records, not a count of individual physical buildings. One parcel can contain multiple buildings.",
    "deduplication": "The source was a stacked weekly snapshot history. Records were deduplicated to one record per parcel before aggregation; summing raw snapshots would over-count the stock by about 2.65 times.",
    "filters": "Commercial and industrial use groups only. Building-area values were bounded to remove known sentinel and implausible values before average square footage was calculated.",
    "missingness": "Construction era is unknown for 39.4% of published properties. The pre-2000 share excludes those unknown-era records from its denominator.",
    "comparability": "This assessor-parcel dataset measures state-level age, size, and assessed-value distributions. It is separate from Level CFO serviceable-building counts derived from FEMA/ORNL structure footprints, which count physical buildings inside state and metro polygons."
  },
  "source_access": "citation-text-only"
}