{
  "address": "4521 18th Street, San Francisco, CA 94114",
  "path": "/san-francisco/castro/18th-street/4521/",
  "apn": "2691042",
  "block": "2691",
  "lot": "042",
  "eas_baseid": "344276",
  "coordinates": {
    "lat": 37.760309,
    "lng": -122.439877
  },
  "parcel": {
    "year_built": 1900,
    "units": 1,
    "stories": 1,
    "rooms": 5,
    "bathrooms": 1,
    "lot_area_sqft": 4260,
    "building_area_sqft": 1215,
    "lot_depth_ft": 42,
    "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 18TH                ST0000"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 319342,
    "assessed_improvement_value": 215550,
    "last_sale_date": "1997-07-30"
  },
  "historic_status": {
    "ceqa_status_code": "A",
    "ceqa_status_code_article_10_11": "A",
    "ceqa_status_label": "Historic resource",
    "reason": "Historic Survey Result",
    "yearbuilt": "1900",
    "in_article_10_11_historic_district": false,
    "source": "sf-planning"
  },
  "permits": [
    {
      "number": "200709132638",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2007-09-13",
      "status_date": "2007-09-14",
      "estimated_cost": 1500,
      "revised_cost": 1500,
      "description": "renew app #200502175770 to continue work",
      "source": "sf-building-permits"
    },
    {
      "number": "200502175770",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2005-02-17",
      "status_date": "2005-02-17",
      "estimated_cost": 5000,
      "revised_cost": 5000,
      "description": "repair deck, stairs & railing in rear yard area, (in kind replacement)",
      "source": "sf-building-permits"
    },
    {
      "number": "200501253901",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2005-01-25",
      "status_date": "2005-05-13",
      "estimated_cost": 800,
      "revised_cost": 800,
      "description": "remove and replace in kind totten front stairs. threads and railing, and risers. not more than 50%",
      "source": "sf-building-permits"
    },
    {
      "number": "9502343",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1995-02-17",
      "status_date": "1996-05-03",
      "estimated_cost": 7900,
      "description": "reroofing",
      "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=18TH&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=2691042&$order=closed_roll_year%20DESC&$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=2691&lot=042",
      "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=2691042",
      "retrieved": "2026-07-28"
    },
    {
      "id": "corbett-heights-context-statement",
      "name": "Michael R. Corbett, Corbett Heights, San Francisco (Western Part of Eureka Valley) Historic Context Statement, prepared for Corbett Heights Neighbors and funded by the Historic Preservation Fund Committee, adopted by the San Francisco Historic Preservation Commission 16 August 2017 (Motion No. 0314, Case No. 2015-006003SRV)",
      "query": "http://default.sfplanning.org/Preservation/CorbettHeightsHCS/hp_corbett_hcs_HCS_FINAL-081617.pdf",
      "listing": "https://sfplanning.org/project/sf-histories-historic-context-statements#completed",
      "label": "Corbett Heights Historic Context Statement, adopted 2017",
      "retrieved": "2026-08-13"
    }
  ],
  "historic_survey": {
    "style": "Italianate",
    "here_today_page": "Italianate Style cottage",
    "dcp_1976_survey": "Rated 0 of 5",
    "apn_as_surveyed": "block 2691, lot 42",
    "survey": "Corbett Heights Historic Context Statement (2017)",
    "source": "corbett-heights-context-statement",
    "note": "Listed among the properties the statement puts forward as meriting further study; it is a context statement rather than a survey, and says the list is conservative rather than exhaustive. The 1968 Here Today survey was adopted by the Board of Supervisors under Resolution No. 268-70, so Planning counts the buildings it lists as individual historic resources. The 1976 city architectural survey rated buildings 0 to 5, 5 highest, and was never adopted as a register of historic resources."
  },
  "building": {
    "completed": 1877,
    "completed_conflict": "The assessor's roll gives 1900; the 2017 Corbett Heights context statement dates the building to 1877."
  },
  "historical_record": [
    {
      "kind": "site history",
      "description": "Recorded in the 1968 Here Today survey as once part of a milk ranch, an attribution the statement says needs further research.",
      "source": "corbett-heights-context-statement",
      "date": "before 1877"
    }
  ]
}