{
  "address": "3520 21st Street, San Francisco, CA 94114",
  "path": "/san-francisco/castro/21st-street/3520/",
  "apn": "3606015",
  "block": "3606",
  "lot": "015",
  "eas_baseid": "362170",
  "coordinates": {
    "lat": 37.756829,
    "lng": -122.426239
  },
  "parcel": {
    "year_built": 1901,
    "units": 1,
    "stories": 1,
    "rooms": 7,
    "bathrooms": 2,
    "bedrooms": 2,
    "lot_area_sqft": 3107,
    "building_area_sqft": 1942,
    "basement_area_sqft": 706,
    "use": "Single Family Residential",
    "property_class": "Dwelling",
    "construction_type_code": "D",
    "zoning": "RH-2",
    "supervisor_district": 8,
    "assessor_neighborhood": "Eureka Valley/Dolores Heights",
    "analysis_neighborhood": "Castro/Upper Market",
    "property_location_raw": "0000 3520 21ST                ST0000"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 1598901,
    "assessed_improvement_value": 1089740,
    "last_sale_date": "2005-08-26"
  },
  "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": "1901",
    "in_article_10_11_historic_district": false,
    "source": "sf-planning"
  },
  "permits": [
    {
      "number": "202012291853",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2020-12-29",
      "status_date": "2021-02-11",
      "estimated_cost": 4000,
      "revised_cost": 4000,
      "description": "replace 2 existing skylights in bathroom",
      "source": "sf-building-permits"
    },
    {
      "number": "202008262672",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2020-08-26",
      "status_date": "2021-02-11",
      "estimated_cost": 50000,
      "revised_cost": 50000,
      "description": "bathroom remodel, no change to footprint, not moving walls",
      "source": "sf-building-permits"
    },
    {
      "number": "200009059690",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2000-09-05",
      "status_date": "2000-09-07",
      "revised_cost": 1000,
      "description": "change two windows",
      "source": "sf-building-permits"
    },
    {
      "number": "200003235187",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2000-03-23",
      "status_date": "2000-08-15",
      "estimated_cost": 20000,
      "revised_cost": 20000,
      "description": "revise 9912275,9919400,9924005 & 20000105305. finish laundry rm, & excercise rm",
      "source": "sf-building-permits"
    },
    {
      "number": "20000105305",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2000-01-05",
      "status_date": "2000-08-15",
      "estimated_cost": 300,
      "revised_cost": 300,
      "description": "revised foundation details to conform to site conditions",
      "source": "sf-building-permits"
    },
    {
      "number": "9924005",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1999-11-10",
      "status_date": "2000-08-15",
      "estimated_cost": 6000,
      "description": "remodel room in garage level, electrical work, painting",
      "source": "sf-building-permits"
    },
    {
      "number": "9919400",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1999-09-15",
      "status_date": "2002-02-05",
      "estimated_cost": 1,
      "description": "revd foundtn details to conform to site cond-9912275",
      "source": "sf-building-permits"
    },
    {
      "number": "9913709",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1999-07-06",
      "status_date": "2000-08-15",
      "estimated_cost": 1,
      "description": "replace property line retaining wall",
      "source": "sf-building-permits"
    },
    {
      "number": "9912275",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1999-06-21",
      "status_date": "2000-08-15",
      "estimated_cost": 20000,
      "description": "voluntary foundation upgrade & vol. plywood paneling at rear",
      "source": "sf-building-permits"
    },
    {
      "number": "9822480",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1998-11-02",
      "status_date": "2000-08-15",
      "estimated_cost": 9200,
      "description": "install new tar tile on roof,repair fire escape/windows",
      "source": "sf-building-permits"
    },
    {
      "number": "9805564",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1998-04-01",
      "status_date": "1998-10-01",
      "estimated_cost": 8000,
      "description": "change closet space in bedrm into bathrm/installing fixtures",
      "source": "sf-building-permits"
    },
    {
      "number": "9613928",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "1996-07-31",
      "status_date": "1997-04-24",
      "estimated_cost": 19000,
      "revised_cost": 8000,
      "description": "repl roof deck over garage,add skylights bet.rafters",
      "source": "sf-building-permits"
    },
    {
      "number": "9303721",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1993-03-08",
      "status_date": "1993-12-14",
      "estimated_cost": 3000,
      "description": "two new partitions for closing & dividing the space",
      "source": "sf-building-permits"
    },
    {
      "number": "8402907",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "1984-03-19",
      "status_date": "1984-09-13",
      "estimated_cost": 4800,
      "description": "4 skylights 24\"x48\" 1 12\"x48\" fixed glass window change .",
      "source": "sf-building-permits"
    },
    {
      "number": "8109230",
      "type": "additions alterations or repairs",
      "status": "cancelled",
      "filed": "1981-10-23",
      "status_date": "1982-04-27",
      "estimated_cost": 3000,
      "source": "sf-building-permits"
    },
    {
      "number": "8109513",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "1981-10-03",
      "status_date": "1983-03-04",
      "estimated_cost": 7000,
      "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=21ST&street_type=ST&address_number=3520",
      "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=3606015&$order=closed_roll_year%20DESC&$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=3606&lot=015",
      "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=3606015",
      "retrieved": "2026-07-28"
    }
  ]
}