{
  "address": "4100 20th Street, San Francisco, CA 94114",
  "path": "/san-francisco/castro/20th-street/4100/",
  "apn": "3602015",
  "block": "3602",
  "lot": "015",
  "eas_baseid": "361843",
  "coordinates": {
    "lat": 37.758031,
    "lng": -122.43269
  },
  "parcel": {
    "year_built": 1905,
    "units": 1,
    "stories": 3,
    "rooms": 10,
    "bathrooms": 3,
    "bedrooms": 4,
    "lot_area_sqft": 2448,
    "building_area_sqft": 2678,
    "basement_area_sqft": 1013,
    "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 4100 20TH                ST0000"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 2264502,
    "assessed_improvement_value": 970499,
    "last_sale_date": "2019-05-17"
  },
  "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": "1905",
    "in_article_10_11_historic_district": false,
    "source": "sf-planning"
  },
  "permits": [
    {
      "number": "202205234764",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2022-05-23",
      "status_date": "2022-05-23",
      "estimated_cost": 17100,
      "revised_cost": 17100,
      "description": "re-roofing: remove and replace roofing material / existing roofing material (in-kind)",
      "source": "sf-building-permits"
    },
    {
      "number": "202009164263",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2020-09-16",
      "status_date": "2020-11-10",
      "estimated_cost": 8000,
      "revised_cost": 8000,
      "description": "back out concrete in 2 car garage floors and pour new concrete in kind",
      "source": "sf-building-permits"
    },
    {
      "number": "M732747",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2016-10-24",
      "status_date": "2016-10-24",
      "revised_cost": 1,
      "description": "street space permit",
      "source": "sf-building-permits"
    },
    {
      "number": "201504133512",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2015-04-13",
      "status_date": "2015-09-01",
      "estimated_cost": 150000,
      "revised_cost": 150000,
      "description": "remodel (e) kitchen, remodel (e) bathrom, add bathroom, replace (e) deck.",
      "source": "sf-building-permits"
    },
    {
      "number": "200907213100",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2009-07-21",
      "status_date": "2009-07-22",
      "estimated_cost": 750,
      "revised_cost": 750,
      "description": "repair to rear steps & deck less than 10%, dryrot damage.",
      "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=4100",
      "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=3602015&$order=closed_roll_year%20DESC&$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=3602&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=3602015",
      "retrieved": "2026-07-28"
    },
    {
      "id": "eureka-valley-context-statement",
      "name": "Elaine B. Stiles, Eureka Valley Historic Context Statement, prepared for the Eureka Valley Neighborhood Association, adopted by the Historic Preservation Commission December 20, 2017",
      "query": "http://default.sfplanning.org/Preservation/EurekaValleyHCS/hp_eureka_valley_hcs_HCS_FINAL-122017.pdf",
      "listing": "https://sfplanning.org/project/sf-histories-historic-context-statements#completed",
      "label": "Eureka Valley Historic Context Statement, adopted 2017",
      "retrieved": "2026-08-14"
    }
  ],
  "historic_survey": {
    "survey": "Eureka Valley Historic Context Statement (2017)",
    "source": "eureka-valley-context-statement",
    "style": "Queen Anne",
    "year_built_as_surveyed": "1899",
    "note": "Listed among the houses Fernando Nelson built in Eureka Valley. The statement is reconnaissance-level and says inclusion in it is not a judgement on a building's worthiness for preservation. It records it as a single-storey end-gable dwelling with entry porch and bay window."
  },
  "building": {
    "builder": "Fernando Nelson"
  }
}