{
  "address": "4127 20th Street, San Francisco, CA 94114",
  "path": "/san-francisco/castro/20th-street/4127/",
  "apn": "3603087",
  "block": "3603",
  "lot": "087",
  "eas_baseid": "361994",
  "coordinates": {
    "lat": 37.757534,
    "lng": -122.433159
  },
  "parcel": {
    "year_built": 1898,
    "stories": 3,
    "rooms": 9,
    "bathrooms": 2,
    "bedrooms": 4,
    "lot_area_sqft": 2850,
    "building_area_sqft": 2376,
    "lot_depth_ft": 14,
    "use": "Single Family Residential",
    "property_class": "Dwelling",
    "construction_type_code": "NA",
    "zoning": "RH-2",
    "supervisor_district": 8,
    "assessor_neighborhood": "Eureka Valley/Dolores Heights",
    "analysis_neighborhood": "Castro/Upper Market",
    "property_location_raw": "0000 4127 20TH                ST0000"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 3528516,
    "assessed_improvement_value": 1512221,
    "last_sale_date": "2022-05-17"
  },
  "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": "1898",
    "in_article_10_11_historic_district": false,
    "source": "sf-planning"
  },
  "permits": [
    {
      "number": "M811227",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2017-07-19",
      "status_date": "2017-07-20",
      "revised_cost": 1,
      "description": "street space",
      "source": "sf-building-permits"
    },
    {
      "number": "201704275091",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2017-04-27",
      "status_date": "2019-05-31",
      "estimated_cost": 5000,
      "revised_cost": 5000,
      "description": "revision to 201703272423, enlarge bathroom and master closet at 3rd floor. remove (2) walls at the third floor story for new plan configuration.",
      "source": "sf-building-permits"
    },
    {
      "number": "201703272423",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2017-03-27",
      "status_date": "2019-05-31",
      "estimated_cost": 100000,
      "revised_cost": 100000,
      "description": "2 baths remodel , 1 bedroom enlarge & repalce windows not visible form the street , windows not on the property line",
      "source": "sf-building-permits"
    },
    {
      "number": "201703232148",
      "type": "otc alterations permit",
      "status": "withdrawn",
      "filed": "2017-03-23",
      "status_date": "2017-03-27",
      "estimated_cost": 100000,
      "revised_cost": 0,
      "description": "remodel 2 bathrooms - all plumbing, electrical, tile & finishes, fixtures. lighting, move one non bearing wall. 1 bedroom - enlrage & replace windows - not visible from street.",
      "source": "sf-building-permits"
    },
    {
      "number": "M735647",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2016-11-02",
      "status_date": "2017-05-18",
      "revised_cost": 1,
      "description": "street space",
      "source": "sf-building-permits"
    },
    {
      "number": "M454287",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2013-12-30",
      "status_date": "2013-12-30",
      "revised_cost": 1,
      "description": "street space",
      "source": "sf-building-permits"
    },
    {
      "number": "200811136435",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2008-11-13",
      "status_date": "2008-11-13",
      "estimated_cost": 21000,
      "revised_cost": 21000,
      "description": "reroofing",
      "source": "sf-building-permits"
    },
    {
      "number": "200806053732",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "2008-06-05",
      "status_date": "2013-02-04",
      "estimated_cost": 14000,
      "revised_cost": 14000,
      "description": "install 30' of new cabinets in existing home theater new hw floor new wall paper on 2nd floor",
      "source": "sf-building-permits"
    },
    {
      "number": "9220205",
      "type": "additions alterations or repairs",
      "status": "expired",
      "filed": "1992-11-20",
      "status_date": "1994-02-25",
      "estimated_cost": 15000,
      "description": "misc-1 park space. delete 2 skylites, box. install 5 window+",
      "source": "sf-building-permits"
    },
    {
      "number": "9204246",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "1992-03-18",
      "status_date": "1993-08-24",
      "estimated_cost": 100000,
      "description": "horizontal addition",
      "source": "sf-building-permits"
    },
    {
      "number": "8816408",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1988-10-28",
      "status_date": "1989-03-29",
      "estimated_cost": 1480,
      "description": "install aluminum windows",
      "source": "sf-building-permits"
    },
    {
      "number": "8408587",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1984-08-08",
      "status_date": "1985-01-16",
      "estimated_cost": 900,
      "revised_cost": 0,
      "description": "replace decking & rails on existing decks",
      "source": "sf-building-permits"
    },
    {
      "number": "8408350",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "1984-08-01",
      "status_date": "1985-04-24",
      "estimated_cost": 1000,
      "description": "replace decking & rails,construct 12'x15'grd level deck",
      "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=4127",
      "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=3603087&$order=closed_roll_year%20DESC&$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=3603&lot=087",
      "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=3603087",
      "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",
    "address_as_surveyed": "4127-4129 20th Street",
    "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 two-flat."
  },
  "building": {
    "builder": "Fernando Nelson"
  }
}