{
  "address": "3639–3641 20th Street, San Francisco, CA 94110",
  "path": "/san-francisco/mission/20th-street/3639/",
  "apn": "3608068",
  "block": "3608",
  "lot": "068",
  "eas_baseid": "362348",
  "coordinates": {
    "lat": 37.758202,
    "lng": -122.422158
  },
  "address_range": "3639–3641",
  "street_numbers_on_parcel": [
    "3639",
    "3641"
  ],
  "parcel": {
    "year_built": 1912,
    "units": 2,
    "stories": 4,
    "rooms": 9,
    "bathrooms": 5,
    "bedrooms": 4,
    "lot_area_sqft": 2874,
    "building_area_sqft": 5247,
    "use": "Multi-Family Residential",
    "property_class": "Flats & Duplex",
    "construction_type_code": "D",
    "zoning": "RH-3",
    "supervisor_district": 9,
    "assessor_neighborhood": "Eureka Valley/Dolores Heights",
    "analysis_neighborhood": "Mission",
    "property_location_raw": "3641 3639 20TH                ST0000"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 1491582,
    "assessed_improvement_value": 2166659
  },
  "historic_status": {
    "ceqa_status_code": "A",
    "ceqa_status_code_article_10_11": "A*",
    "ceqa_status_label": "Historic resource",
    "reason": "Article 10 Historic District, California Register Historic District",
    "yearbuilt": "1912",
    "in_article_10_11_historic_district": true,
    "source": "sf-planning"
  },
  "historic_district": {
    "name": "Liberty Hill Historic District",
    "california_register_status": "Eligible (not listed)",
    "national_register_status": "Not listed",
    "article_10_11_status": "Article 10 historic district",
    "local_landmark_protection": true,
    "period_of_significance": "1860s–1906",
    "source": "sf-historic-districts"
  },
  "permits": [
    {
      "number": "202009265151",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2020-09-26",
      "status_date": "2026-02-23",
      "estimated_cost": 4000,
      "revised_cost": 4000,
      "description": "installation of new sprinkler monitoring system. ref bpa#201909181982",
      "source": "sf-building-permits"
    },
    {
      "number": "M1218948",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2020-08-03",
      "status_date": "2020-08-05",
      "revised_cost": 0,
      "description": "street space",
      "source": "sf-building-permits"
    },
    {
      "number": "201909181982",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2019-09-18",
      "status_date": "2020-10-28",
      "estimated_cost": 15000,
      "revised_cost": 15000,
      "description": "install 61 sprinklers throughout per nfpa#13r underground pr nfpa#24 ti 201705166649",
      "source": "sf-building-permits"
    },
    {
      "number": "201905079943",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "2019-05-07",
      "status_date": "2020-12-17",
      "estimated_cost": 1,
      "revised_cost": 5000,
      "description": "revision to pa# 201705166649 & pa# 201904168072. relocation and addition of new windows and new skylight and new finish at (e) driveway. include regrading of side yard to match (e) neighbor's grade.",
      "source": "sf-building-permits"
    },
    {
      "number": "201904168072",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2019-04-16",
      "status_date": "2020-12-17",
      "estimated_cost": 1,
      "revised_cost": 1,
      "description": "revision to pa 2017-0516-6649 - minor reconfiguration to interior wall layout at all floors. scope of work does not include any exterior work revision",
      "source": "sf-building-permits"
    },
    {
      "number": "M859427",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2017-11-28",
      "status_date": "2017-11-28",
      "revised_cost": 1,
      "description": "street space",
      "source": "sf-building-permits"
    },
    {
      "number": "M795347",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2017-06-09",
      "status_date": "2017-06-09",
      "revised_cost": 1,
      "description": "street space permit",
      "source": "sf-building-permits"
    },
    {
      "number": "201705166649",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "2017-05-16",
      "status_date": "2020-12-17",
      "estimated_cost": 150000,
      "revised_cost": 280000,
      "description": "interior: remove (e) bdrm on 1st flr. relocate (e) bdrm to (n) master bed & bath, lundry/storage @basement @rear.reconfig closets on 2nd flr. structural upgrades. reconfig bath & lvng rm @attic for (n)roof deck. exterior: replace (e)windows @front/side. (e) front doors to remain w/(e) glazing",
      "source": "sf-building-permits"
    },
    {
      "number": "201701106842",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "2017-01-10",
      "status_date": "2020-12-17",
      "estimated_cost": 530000,
      "revised_cost": 530000,
      "description": "new storage, laundry, mech rm in e storage space at basement interior layout & modification to unit in 1st fl, expansion of 2nd unit into (e) attic and new interior stairs. exterior work to include new skylights at (e) roof only. scope includes fully automatic sprinkler sys(separate permit).",
      "source": "sf-building-permits"
    },
    {
      "number": "201609218342",
      "type": "otc alterations permit",
      "status": "suspend",
      "filed": "2016-09-21",
      "status_date": "2025-08-26",
      "estimated_cost": 50000,
      "revised_cost": 225000,
      "description": "replace extg foundation. create new basement storage space @ rear area of 1st floor.",
      "source": "sf-building-permits"
    },
    {
      "number": "200905218933",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2009-05-21",
      "status_date": "2009-09-30",
      "estimated_cost": 8500,
      "revised_cost": 8500,
      "description": "light roof maintenance and repair of 3' rotten wood gutter & paint. gutten to be replace w/copper. no structural changees repair in kind.",
      "source": "sf-building-permits"
    },
    {
      "number": "200901291010",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2009-01-29",
      "status_date": "2009-09-01",
      "estimated_cost": 12500,
      "revised_cost": 12500,
      "description": "revision to pa# 2008-1003-3381-replace a portion of the east foundation, voluntary strengthening at ground floor level.",
      "source": "sf-building-permits"
    },
    {
      "number": "200810033381",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2008-10-03",
      "status_date": "2009-09-01",
      "estimated_cost": 30000,
      "revised_cost": 32000,
      "description": "replace a portion of the west foundation. replace north foundation, voluntary strengthening at ground floor level",
      "source": "sf-building-permits"
    },
    {
      "number": "9920741",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1999-10-01",
      "status_date": "1999-11-10",
      "estimated_cost": 1,
      "description": "renew pa#9906660 for final inspection",
      "source": "sf-building-permits"
    },
    {
      "number": "9906660",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1999-04-07",
      "status_date": "1999-08-07",
      "estimated_cost": 4800,
      "description": "dryrot repair on rear facade above & below deck-in kind",
      "source": "sf-building-permits"
    },
    {
      "number": "9502988",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1995-03-01",
      "status_date": "1995-09-01",
      "estimated_cost": 6000,
      "description": "reroof",
      "source": "sf-building-permits"
    },
    {
      "number": "9210134",
      "type": "additions alterations or repairs",
      "status": "expired",
      "filed": "1992-06-19",
      "status_date": "1992-11-02",
      "estimated_cost": 3200,
      "description": "pour concrete foundation for concrete block",
      "source": "sf-building-permits"
    },
    {
      "number": "9022390",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1990-10-30",
      "status_date": "1990-11-14",
      "estimated_cost": 2648,
      "description": "vinyl siding (alside) to back of house from deck up",
      "source": "sf-building-permits"
    },
    {
      "number": "9018846",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "1990-09-18",
      "status_date": "1991-01-15",
      "estimated_cost": 1,
      "description": "revision to",
      "source": "sf-building-permits"
    },
    {
      "number": "9013554",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "1990-07-12",
      "status_date": "1991-01-15",
      "estimated_cost": 8000,
      "description": "remodel upper unit kitchen and convert a part of it",
      "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=3639",
      "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=3608068&$order=closed_roll_year%20DESC&$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=3608&lot=068",
      "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=3608068",
      "retrieved": "2026-07-31"
    },
    {
      "id": "sf-historic-districts",
      "name": "SF Planning Department — Historic Districts via DataSF",
      "query": "https://data.sfgov.org/resource/63x5-g3m4.json?$where=intersects(the_geom,%20%27POINT(-122.42215829868833%2037.758202410394354)%27)",
      "retrieved": "2026-07-31"
    }
  ]
}