{
  "address": "4001 20th Street, San Francisco, CA 94114",
  "path": "/san-francisco/castro/20th-street/4001/",
  "apn": "3604001",
  "block": "3604",
  "lot": "001",
  "eas_baseid": "477925",
  "coordinates": {
    "lat": 37.757837,
    "lng": -122.430522
  },
  "parcel": {
    "year_built": 2012,
    "stories": 3,
    "rooms": 4,
    "bathrooms": 2,
    "bedrooms": 2,
    "lot_area_sqft": 1999,
    "building_area_sqft": 1893,
    "use": "Single Family Residential",
    "property_class": "Dwelling",
    "construction_type_code": "NA",
    "zoning": "RH-1",
    "supervisor_district": 8,
    "assessor_neighborhood": "Eureka Valley/Dolores Heights",
    "analysis_neighborhood": "Castro/Upper Market",
    "property_location_raw": "0000 4001 20TH                ST0000"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 1059177,
    "assessed_improvement_value": 836182,
    "last_sale_date": "2009-04-07"
  },
  "historic_status": {
    "ceqa_status_code": "C",
    "ceqa_status_code_article_10_11": "C",
    "ceqa_status_label": "Not a historical resource",
    "reason": "Not 45 years or older",
    "yearbuilt": "2012",
    "in_article_10_11_historic_district": false,
    "source": "sf-planning"
  },
  "permits": [
    {
      "number": "201204108013",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2012-04-10",
      "status_date": "2012-05-17",
      "estimated_cost": 1,
      "revised_cost": 1,
      "description": "revision to premit #2009-1014-8947 revise structural framing remove glass floor @ lr and mstr br add hot tub at front yard. (n) access door to crawl to space @ stairway.",
      "source": "sf-building-permits"
    },
    {
      "number": "201109134457",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2011-09-13",
      "status_date": "2012-05-17",
      "estimated_cost": 1,
      "revised_cost": 1,
      "description": "deferred app 200910148947 s1. calculations and details for glazing and glazing support brackets at north east elevations, 1st/2nd fl",
      "source": "sf-building-permits"
    },
    {
      "number": "201012156752",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2010-12-15",
      "status_date": "2012-05-17",
      "estimated_cost": 1,
      "revised_cost": 1,
      "description": "revision to work in refernece to pa #200910148947-s1: revise shoring design for garage/1st floor.",
      "source": "sf-building-permits"
    },
    {
      "number": "M226626",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2010-10-26",
      "status_date": "2010-10-26",
      "revised_cost": 1,
      "description": "street space",
      "source": "sf-building-permits"
    },
    {
      "number": "200910148947",
      "type": "new construction wood frame",
      "status": "complete",
      "filed": "2009-10-14",
      "status_date": "2012-05-17",
      "estimated_cost": 600000,
      "revised_cost": 600000,
      "description": "to erect 3 stories single family dwelling unit.",
      "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=4001",
      "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=3604001&$order=closed_roll_year%20DESC&$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=3604&lot=001",
      "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=3604001",
      "retrieved": "2026-07-28"
    }
  ]
}