{
  "address": "3450 21st Street, San Francisco, CA 94110",
  "path": "/san-francisco/mission/21st-street/3450/",
  "apn": "3607019A",
  "block": "3607",
  "lot": "019A",
  "eas_baseid": "362240",
  "coordinates": {
    "lat": 37.75694,
    "lng": -122.424559
  },
  "parcel": {
    "year_built": 1928,
    "units": 1,
    "stories": 3,
    "rooms": 13,
    "bathrooms": 4,
    "bedrooms": 4,
    "lot_area_sqft": 7980,
    "building_area_sqft": 7368,
    "basement_area_sqft": 2603,
    "lot_depth_ft": 14,
    "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": "Mission",
    "property_location_raw": "0000 3450 21ST                ST0000"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 16126200,
    "assessed_improvement_value": 16126200,
    "last_sale_date": "2022-07-01"
  },
  "historic_status": {
    "ceqa_status_code": "B",
    "ceqa_status_code_article_10_11": "B",
    "ceqa_status_label": "Unevaluated",
    "reason": "Historic Survey Result and 45 years or older",
    "yearbuilt": "1928",
    "in_article_10_11_historic_district": false,
    "source": "sf-planning"
  },
  "permits": [
    {
      "number": "202011209380",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2020-11-20",
      "status_date": "2022-06-21",
      "estimated_cost": 1,
      "revised_cost": 1,
      "description": "underpin property line wall due to foundation work at 3466 21st street - pa 202011058337. approx 28 lf of underpinning.",
      "source": "sf-building-permits"
    },
    {
      "number": "201508063535",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2015-08-06",
      "status_date": "2015-11-05",
      "estimated_cost": 5000,
      "revised_cost": 20000,
      "description": "revision to (e) permitted 4th floor roof terrace guardrail per inspector comments. weld on stanchions and add additional 1'-7\" glass guardrail top of (e) railing. not visible from public right of way. ref pa 2014 0602 7185. maher na",
      "source": "sf-building-permits"
    },
    {
      "number": "201504143523",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2015-04-14",
      "status_date": "2015-10-22",
      "estimated_cost": 1,
      "revised_cost": 1,
      "description": "provide as built plans for fire sprinkler system original permit 201403271786",
      "source": "sf-building-permits"
    },
    {
      "number": "M556647",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2015-02-04",
      "status_date": "2015-02-04",
      "revised_cost": 1,
      "description": "street space permit",
      "source": "sf-building-permits"
    },
    {
      "number": "201410249835",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2014-10-24",
      "status_date": "2015-10-16",
      "estimated_cost": 35000,
      "revised_cost": 35000,
      "description": "add air conditioning to house. condensers mounted on platform behind existing roof ridges and not visible from street. platform includes visual acoustical shroud, shall comply with all sf noise ordinance requirements",
      "source": "sf-building-permits"
    },
    {
      "number": "201410219529",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2014-10-21",
      "status_date": "2014-10-22",
      "estimated_cost": 108000,
      "revised_cost": 108000,
      "description": "readjustment of project valuation for 201301228447. additional 108,000 value per bid inspector clancy. total cost: 173,000",
      "source": "sf-building-permits"
    },
    {
      "number": "M509147",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2014-08-06",
      "status_date": "2014-08-06",
      "revised_cost": 1,
      "description": "street space",
      "source": "sf-building-permits"
    },
    {
      "number": "201407010163",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2014-07-01",
      "status_date": "2015-10-22",
      "estimated_cost": 10000,
      "revised_cost": 13000,
      "description": "install underground fire and water line. n/a for the maher ordinance #155-13",
      "source": "sf-building-permits"
    },
    {
      "number": "201406027185",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2014-06-02",
      "status_date": "2015-11-05",
      "estimated_cost": 25000,
      "revised_cost": 25000,
      "description": "legalize 4th floor as habitable , add bathroom to 4th floor , convert (e) flat roof visible at rear & east facade to accupiable roof deck.n/a maher",
      "source": "sf-building-permits"
    },
    {
      "number": "201405024762",
      "type": "otc alterations permit",
      "status": "withdrawn",
      "filed": "2014-05-02",
      "status_date": "2014-10-20",
      "estimated_cost": 20000,
      "revised_cost": 0,
      "description": "add rooftop mechanical equipment & utility access hatch. provide decorative metal screening & guardrail. compliance with ordinance #155-13 not required",
      "source": "sf-building-permits"
    },
    {
      "number": "201403281963",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2014-03-28",
      "status_date": "2015-02-19",
      "estimated_cost": 25000,
      "revised_cost": 30000,
      "description": "slate roof replacement in-kind, additional brick facade and chimney chase brick replacement in-kind, prevous in-kind work approved under pa # 201304124474 & 201302281213. \"reroofing under separate permit by c-39 contractor\"",
      "source": "sf-building-permits"
    },
    {
      "number": "201403271786",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2014-03-27",
      "status_date": "2015-10-22",
      "estimated_cost": 19000,
      "revised_cost": 39000,
      "description": "install overhead (only) fire sprinkler system, per nfpa 13. 90 sprinklers. underground service by others. 201304124474. n/a for the maher ordinance #155-13",
      "source": "sf-building-permits"
    },
    {
      "number": "201402208973",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "2014-02-20",
      "status_date": "2015-11-05",
      "estimated_cost": 1,
      "revised_cost": 1,
      "description": "relocation of dormer @ rear of building. dormer previously approved under pa# 2013/04/12/4474. ** maher: compliance with ordinance no# 155-13 not required **",
      "source": "sf-building-permits"
    },
    {
      "number": "M459947",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2014-01-28",
      "status_date": "2014-01-28",
      "revised_cost": 1,
      "description": "street space permit",
      "source": "sf-building-permits"
    },
    {
      "number": "M411107",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2013-07-25",
      "status_date": "2013-07-25",
      "revised_cost": 1,
      "description": "street space permit",
      "source": "sf-building-permits"
    },
    {
      "number": "201304245332",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2013-04-24",
      "status_date": "2014-05-13",
      "estimated_cost": 30000,
      "revised_cost": 30000,
      "description": "compl w/nov #201399041 dated 4/22/13 -replace in-kind exterior wall & stair at 1st floor east elevation along gridline three due to existing inadequate structural conditions. original seismic upgrade under pa #2013.02.28.1213.",
      "source": "sf-building-permits"
    },
    {
      "number": "201304124474",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "2013-04-12",
      "status_date": "2015-11-05",
      "estimated_cost": 750000,
      "revised_cost": 750000,
      "description": "1st, 2nd & 3rd fl additions at rear & side yards. reconfigured landscaping & terracing. replace fence & gate at front yard. reconfigured roof & dormers at rear & secondary facades. replace & restore windows in-kind.",
      "source": "sf-building-permits"
    },
    {
      "number": "M384847",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2013-04-11",
      "status_date": "2013-04-11",
      "revised_cost": 1,
      "description": "sidewalk repair",
      "source": "sf-building-permits"
    },
    {
      "number": "201302281213",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2013-02-28",
      "status_date": "2015-11-05",
      "estimated_cost": 720000,
      "revised_cost": 720000,
      "description": "(n) habitable space on 1st flr, includes, office, media rm, 1/2 bath, mudroom, laundry rm & wine room w/ wet bar. 2nd fl add 1/2 bath & interior remodel on 2nd, 3rd & 4th fls. seismic upgrade, exterior stucco replaced in kind. three doors replaced in-kind. brick in-fill of three windows at side elev",
      "source": "sf-building-permits"
    },
    {
      "number": "201301228447",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2013-01-22",
      "status_date": "2015-10-16",
      "estimated_cost": 65000,
      "revised_cost": 65000,
      "description": "remodel kitchen aqnd 6 bathrooms. no structural.",
      "source": "sf-building-permits"
    },
    {
      "number": "201201172310",
      "type": "new construction wood frame",
      "status": "cancelled",
      "filed": "2012-01-17",
      "status_date": "2018-06-20",
      "estimated_cost": 40000,
      "revised_cost": 60000,
      "description": "erect 1 story,type 5 building,green house (accessory to dwelling).",
      "source": "sf-building-permits"
    },
    {
      "number": "9814666",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1998-07-31",
      "status_date": "1998-08-26",
      "estimated_cost": 8000,
      "description": "remove & replace extg sliding door & casemont window/rpr stc",
      "source": "sf-building-permits"
    },
    {
      "number": "9811578",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1998-06-22",
      "status_date": "1999-03-01",
      "estimated_cost": 2800,
      "description": "reroofing",
      "source": "sf-building-permits"
    },
    {
      "number": "9809392",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1998-05-26",
      "status_date": "1998-08-26",
      "estimated_cost": 1000,
      "description": "dry rot repair",
      "source": "sf-building-permits"
    },
    {
      "number": "9704894",
      "type": "additions alterations or repairs",
      "status": "expired",
      "filed": "1997-03-17",
      "status_date": "1998-04-09",
      "estimated_cost": 75000,
      "description": "remodel (e)kitchen,bathrm & library,add 2 new windows",
      "source": "sf-building-permits"
    },
    {
      "number": "9702685",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1997-02-13",
      "status_date": "1997-04-25",
      "estimated_cost": 5000,
      "description": "demolition of kitchen & bath,remvoe cabinets,plaster,fixture",
      "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=21ST&street_type=ST&address_number=3450",
      "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=3607019A&$order=closed_roll_year%20DESC&$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=3607&lot=019A",
      "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=3607019A",
      "retrieved": "2026-07-31"
    }
  ]
}