{
  "address": "3660 20th Street, San Francisco, CA 94110",
  "path": "/san-francisco/mission/20th-street/3660/",
  "apn": "3597022",
  "block": "3597",
  "lot": "022",
  "eas_baseid": "361560",
  "coordinates": {
    "lat": 37.758663,
    "lng": -122.422636
  },
  "parcel": {
    "year_built": 1907,
    "units": 5,
    "stories": 2,
    "rooms": 15,
    "bathrooms": 5,
    "lot_area_sqft": 2866,
    "building_area_sqft": 3862,
    "use": "Multi-Family Residential",
    "property_class": "Apartment 5 to 14 Units",
    "construction_type_code": "D",
    "zoning": "RH-3",
    "supervisor_district": 9,
    "assessor_neighborhood": "Mission Dolores",
    "analysis_neighborhood": "Mission",
    "property_location_raw": "0000 3660 20TH                ST0000"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 1082432,
    "assessed_improvement_value": 270608,
    "last_sale_date": "2021-12-03"
  },
  "historic_status": {
    "ceqa_status_code": "C",
    "ceqa_status_code_article_10_11": "C",
    "ceqa_status_label": "Not a historical resource",
    "reason": "Historic Survey Result",
    "yearbuilt": "1907",
    "in_article_10_11_historic_district": false,
    "source": "sf-planning"
  },
  "permits": [
    {
      "number": "202409241531",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2024-09-24",
      "status_date": "2025-03-06",
      "estimated_cost": 20000,
      "revised_cost": 20000,
      "description": "one unit: add electric heater to address complaint 201836931 item #2.",
      "source": "sf-building-permits"
    },
    {
      "number": "M921587",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2018-05-02",
      "status_date": "2018-05-02",
      "revised_cost": 1,
      "description": "street space",
      "source": "sf-building-permits"
    },
    {
      "number": "201803012634",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2018-03-01",
      "status_date": "2021-07-20",
      "estimated_cost": 1000,
      "revised_cost": 1000,
      "description": "comply w/ nov#201836171 #4. window repair not visible from the street. any framing to be replaced in-like kind. non structural work.",
      "source": "sf-building-permits"
    },
    {
      "number": "201711133827",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "2017-11-13",
      "status_date": "2021-04-27",
      "estimated_cost": 60000,
      "revised_cost": 60000,
      "description": "soft story retrofit per sfebc chapter 4d. engineering criteria 2016 cebc appendix a-4.",
      "source": "sf-building-permits"
    },
    {
      "number": "201103152162",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2011-03-15",
      "status_date": "2011-03-15",
      "estimated_cost": 500,
      "revised_cost": 700,
      "description": "to comply his nov 201198627dated 2-18-2011",
      "source": "sf-building-permits"
    },
    {
      "number": "M56623",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2007-02-06",
      "status_date": "2007-02-06",
      "revised_cost": 0,
      "description": "street space & sidewalk permit only.",
      "source": "sf-building-permits"
    },
    {
      "number": "9911186",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1999-06-07",
      "status_date": "2001-02-27",
      "estimated_cost": 4000,
      "description": "replace existing stair for new safer unit with new dimensns",
      "source": "sf-building-permits"
    },
    {
      "number": "9825878",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1998-12-18",
      "status_date": "1999-04-18",
      "estimated_cost": 500,
      "description": "repair back stairs to correct nov",
      "source": "sf-building-permits"
    },
    {
      "number": "9101287",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1991-01-28",
      "status_date": "1992-12-02",
      "estimated_cost": 6250,
      "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=20TH&street_type=ST&address_number=3660",
      "retrieved": "2026-07-31"
    },
    {
      "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=3597022&$order=closed_roll_year%20DESC&$limit=1",
      "retrieved": "2026-07-31"
    },
    {
      "id": "sf-building-permits",
      "name": "SF Dept. of Building Inspection via DataSF",
      "query": "https://data.sfgov.org/resource/i98e-djp9.json?block=3597&lot=022",
      "retrieved": "2026-07-31"
    },
    {
      "id": "sf-planning",
      "name": "SF Planning Department — Historic Resource Status by Parcel via DataSF",
      "query": "https://data.sfgov.org/resource/3tsw-4idn.json?apn=3597022",
      "retrieved": "2026-07-31"
    },
    {
      "id": "loc-sf-call-1907-09-01",
      "name": "The San Francisco Call, 1 September 1907, p. 42",
      "query": "https://chroniclingamerica.loc.gov/lccn/sn85066387/1907-09-01/ed-1/seq-42/",
      "retrieved": "2026-10-04"
    }
  ],
  "historical_record": [
    {
      "date": "1907-09-01",
      "kind": "building contract",
      "description": "Buck & McCarthy contracted to put up a two-storey frame building of two tenements.",
      "source": "loc-sf-call-1907-09-01"
    }
  ]
}