{
  "address": "4521 20th Street, San Francisco, CA 94114",
  "path": "/san-francisco/castro/20th-street/4521/",
  "apn": "2749048",
  "block": "2749",
  "lot": "048",
  "eas_baseid": "345433",
  "coordinates": {
    "lat": 37.757239,
    "lng": -122.438437
  },
  "parcel": {
    "year_built": 1900,
    "units": 1,
    "stories": 3,
    "rooms": 11,
    "bathrooms": 1,
    "lot_area_sqft": 2996,
    "building_area_sqft": 3800,
    "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 4521 20TH                ST0000"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 39009,
    "assessed_improvement_value": 76207
  },
  "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": "1900",
    "in_article_10_11_historic_district": false,
    "source": "sf-planning"
  },
  "permits": [
    {
      "number": "202509034506",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2025-09-03",
      "status_date": "2025-09-03",
      "estimated_cost": 80000,
      "revised_cost": 80000,
      "description": "to strengthen and straighten the out of floor walls at the top level of the home",
      "source": "sf-building-permits"
    },
    {
      "number": "201306149626",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2013-06-14",
      "status_date": "2013-07-19",
      "estimated_cost": 10000,
      "revised_cost": 27000,
      "description": "repair existing retaining wall, visible from street.",
      "source": "sf-building-permits"
    },
    {
      "number": "201202013382",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2012-02-01",
      "status_date": "2012-03-14",
      "estimated_cost": 5000,
      "revised_cost": 5000,
      "description": "comply with nov #201172021 dated 11/23/11. remove brick flue, repair siding to match.",
      "source": "sf-building-permits"
    },
    {
      "number": "201201122117",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2012-01-12",
      "status_date": "2012-05-02",
      "estimated_cost": 5000,
      "revised_cost": 5000,
      "description": "backfill and soil nails related to retaining wall repair on address 4515 20th st. see permit application number 2011-1215-0719.",
      "source": "sf-building-permits"
    },
    {
      "number": "201103212483",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2011-03-21",
      "status_date": "2012-05-02",
      "estimated_cost": 5000,
      "revised_cost": 5000,
      "description": "to comply with nov emergency temp repair; provide protection covering",
      "source": "sf-building-permits"
    },
    {
      "number": "9213175",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "1992-08-11",
      "status_date": "1993-04-29",
      "estimated_cost": 200,
      "revised_cost": 4500,
      "description": "horizontal addition",
      "source": "sf-building-permits"
    },
    {
      "number": "9009224",
      "type": "additions alterations or repairs",
      "status": "cancelled",
      "filed": "1990-05-14",
      "status_date": "1994-08-23",
      "estimated_cost": 1500,
      "description": "remove rotting deck over 1/f kitchen and pantry",
      "source": "sf-building-permits"
    },
    {
      "number": "8918760",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1989-10-03",
      "status_date": "1990-04-25",
      "estimated_cost": 4000,
      "revised_cost": 0,
      "description": "remove asbestos shingles and replace wooden shingles",
      "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=4521",
      "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=2749048&$order=closed_roll_year%20DESC&$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=2749&lot=048",
      "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=2749048",
      "retrieved": "2026-07-28"
    }
  ]
}