{
  "address": "3975 20th Street, San Francisco, CA 94114",
  "path": "/san-francisco/castro/20th-street/3975/",
  "apn": "3605057",
  "block": "3605",
  "lot": "057",
  "eas_baseid": "362131",
  "coordinates": {
    "lat": 37.757751,
    "lng": -122.429578
  },
  "parcel": {
    "year_built": 1914,
    "units": 1,
    "stories": 2,
    "rooms": 5,
    "bathrooms": 1,
    "lot_area_sqft": 2850,
    "building_area_sqft": 1512,
    "lot_depth_ft": 14,
    "use": "Single Family Residential",
    "property_class": "Dwelling",
    "construction_type_code": "D",
    "zoning": "RH-1",
    "supervisor_district": 8,
    "assessor_neighborhood": "Eureka Valley/Dolores Heights",
    "analysis_neighborhood": "Castro/Upper Market",
    "property_location_raw": "0000 3975 20TH                ST0000"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 993928,
    "assessed_improvement_value": 425964,
    "last_sale_date": "2010-04-08"
  },
  "historic_status": {
    "ceqa_status_code": "B",
    "ceqa_status_code_article_10_11": "B",
    "ceqa_status_label": "Unevaluated",
    "reason": "No evaluation and 45 years or older",
    "yearbuilt": "1914",
    "in_article_10_11_historic_district": false,
    "source": "sf-planning"
  },
  "permits": [
    {
      "number": "202310128478",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2023-10-12",
      "status_date": "2023-10-12",
      "estimated_cost": 22000,
      "revised_cost": 22000,
      "description": "re-roofing: remove and replace roofing material / existing roofing material (in-kind)",
      "source": "sf-building-permits"
    },
    {
      "number": "201310048514",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2013-10-04",
      "status_date": "2013-10-21",
      "estimated_cost": 1,
      "revised_cost": 1,
      "description": "revision to pa201305156954. omit voluntary seismic strentghening at garage per sheets s1 & sheet s2.1. delte proposed skylight at third floor hall & delete built in cabinets. relocate skylight to bathroom.",
      "source": "sf-building-permits"
    },
    {
      "number": "201305156954",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2013-05-15",
      "status_date": "2013-10-21",
      "estimated_cost": 65000,
      "revised_cost": 65000,
      "description": "repartitioning & interior renovation of 3rd floor - bedrooms & bath; add bedroom storage lofts within existing attic space; add (4) new skylights. replace (e) 3rd floor front windows with new wood windows, detailing to match (e), relocate 3rd floor rear window. no change to (e) building envelope.",
      "source": "sf-building-permits"
    },
    {
      "number": "9017246",
      "type": "additions alterations or repairs",
      "status": "cancelled",
      "filed": "1990-08-30",
      "status_date": "1992-09-09",
      "estimated_cost": 21000,
      "description": "compelte (e) room rear of garage and install toilet & basin",
      "source": "sf-building-permits"
    },
    {
      "number": "8717173",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1987-12-04",
      "status_date": "1988-02-08",
      "estimated_cost": 4450,
      "description": "repair dry rot at base of wall, garage door jambs.",
      "source": "sf-building-permits"
    }
  ],
  "sources": [
    {
      "id": "sf-eas-addresses",
      "name": "SF Enterprise Addressing System via DataSF",
      "query": "https://data.sfgov.org/resource/3mea-di5p.json?street_name=20TH&street_type=ST&address_number=3975",
      "retrieved": "2026-07-28"
    },
    {
      "id": "sf-assessor-roll",
      "name": "SF Office of the Assessor-Recorder via DataSF (2025 secured roll)",
      "query": "https://data.sfgov.org/resource/wv5m-vpq2.json?parcel_number=3605057&$order=closed_roll_year%20DESC&$limit=1",
      "retrieved": "2026-07-28"
    },
    {
      "id": "sf-building-permits",
      "name": "SF Dept. of Building Inspection via DataSF",
      "query": "https://data.sfgov.org/resource/i98e-djp9.json?block=3605&lot=057",
      "retrieved": "2026-07-28"
    },
    {
      "id": "sf-planning",
      "name": "SF Planning Department — Historic Resource Status by Parcel via DataSF",
      "query": "https://data.sfgov.org/resource/3tsw-4idn.json?apn=3605057",
      "retrieved": "2026-07-28"
    }
  ]
}