{
  "address": "3421–3431 20th Street, San Francisco, CA 94110",
  "path": "/san-francisco/mission/20th-street/3421/",
  "apn": "3610049",
  "block": "3610",
  "lot": "049",
  "eas_baseid": "362502",
  "coordinates": {
    "lat": 37.758503,
    "lng": -122.417478
  },
  "address_range": "3421–3431",
  "street_numbers_on_parcel": [
    "3421",
    "3423",
    "3425",
    "3427",
    "3429",
    "3431"
  ],
  "parcel": {
    "year_built": 1906,
    "units": 6,
    "stories": 3,
    "rooms": 24,
    "bathrooms": 6,
    "lot_area_sqft": 2996,
    "building_area_sqft": 6390,
    "use": "Multi-Family Residential",
    "property_class": "Apartment 5 to 14 Units",
    "construction_type_code": "D",
    "zoning": "RM-1",
    "supervisor_district": 9,
    "assessor_neighborhood": "Inner Mission",
    "analysis_neighborhood": "Mission",
    "property_location_raw": "3431 3421 20TH                ST0000"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 1466253,
    "assessed_improvement_value": 666560,
    "last_sale_date": "2014-09-09"
  },
  "historic_status": {
    "ceqa_status_code": "A",
    "ceqa_status_code_article_10_11": "A",
    "ceqa_status_label": "Historic resource",
    "reason": "Historic Survey Result",
    "yearbuilt": "1906",
    "in_article_10_11_historic_district": false,
    "source": "sf-planning"
  },
  "permits": [
    {
      "number": "202602105683",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2026-02-10",
      "status_date": "2026-02-10",
      "estimated_cost": 280000,
      "revised_cost": 200000,
      "description": "recommencement and completion of work approved under 201803295058 and 202009275177",
      "source": "sf-building-permits"
    },
    {
      "number": "202409130714",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2024-09-13",
      "status_date": "2025-07-03",
      "estimated_cost": 1,
      "revised_cost": 1,
      "description": "as built revision for bpa# 201612306363 and 202002073886: structural plan update framing and foundation.",
      "source": "sf-building-permits"
    },
    {
      "number": "202409130721",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2024-09-13",
      "status_date": "2025-07-03",
      "estimated_cost": 24000,
      "revised_cost": 24000,
      "description": "replace furnace & water heaters ( no fire rated assembly penetration). 2/f , 3/f & 4/f (total 6 units)",
      "source": "sf-building-permits"
    },
    {
      "number": "202408209097",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2024-08-20",
      "status_date": "2024-08-23",
      "estimated_cost": 980,
      "revised_cost": 980,
      "description": "1) repair /replace 3 vinyl windows at rear backyard wall, side wall 2) repair broken glass sidewall",
      "source": "sf-building-permits"
    },
    {
      "number": "202405061505",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2024-05-06",
      "status_date": "2024-08-23",
      "estimated_cost": 3500,
      "revised_cost": 3500,
      "description": "to abate nov 202307809- #2- repair window sill; #5- repair stairs; #11-repair damaged walls; #12-repair floor",
      "source": "sf-building-permits"
    },
    {
      "number": "202312202841",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2023-12-20",
      "status_date": "2024-01-19",
      "estimated_cost": 15000,
      "revised_cost": 15000,
      "description": "siding replacement at rear walls, waterproofing side walls",
      "source": "sf-building-permits"
    },
    {
      "number": "202310319887",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2023-10-31",
      "status_date": "2023-10-31",
      "estimated_cost": 1000,
      "revised_cost": 1200,
      "description": "as builts to pa 202309267461. install 2 new monitor modules on ground fl to tie-in new floor and tamper switches to (e) contorl panel.",
      "source": "sf-building-permits"
    },
    {
      "number": "202309267461",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2023-09-26",
      "status_date": "2023-09-26",
      "estimated_cost": 15000,
      "revised_cost": 15000,
      "description": "upgrade (e) fire alarm system to meet sec 1103.7.6.1. (e) control panel & initiating devices stay @ their original location. (e) bells will be replaced w/horn strobes; install new power supply panel; 4 new pull stations & 2 new horn/strobes; new low frequency horns inside all units.",
      "source": "sf-building-permits"
    },
    {
      "number": "202208049954",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2022-08-04",
      "status_date": "2022-08-04",
      "estimated_cost": 1,
      "revised_cost": 1,
      "description": "to obtain final inspection for work approved under pa# 2016-1230-6363 and 2020-0207-3886: all work is complete.",
      "source": "sf-building-permits"
    },
    {
      "number": "202208019674",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2022-08-01",
      "status_date": "2022-08-30",
      "estimated_cost": 80000,
      "revised_cost": 110000,
      "description": "3427/3429/3431 20th street: each unit: remodel (e) kitchen and bathroom including any dry rot repair and replacement all in-kind. each unit add 1 bathroom and washer/dryer laundry box.",
      "source": "sf-building-permits"
    },
    {
      "number": "202206065680",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2022-06-06",
      "status_date": "2022-06-06",
      "estimated_cost": 20000,
      "revised_cost": 20567,
      "description": "install new fire sprinkler system per nfpa 13 for the ground floor only. included 2\" underground fire service. total 26 heads.",
      "source": "sf-building-permits"
    },
    {
      "number": "202202037231",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2022-02-03",
      "status_date": "2022-02-04",
      "estimated_cost": 1,
      "revised_cost": 1,
      "description": "to comply with boa 21-094 (pa 202103317623). work in three units. kitchen and (e) bathroom remodel and decay repair and replace in kind, add bathroom and washer/dryer. window replacement on 2nd, 3rd, 4th floors as in kind (same size/location and function) with front windows to be wood",
      "source": "sf-building-permits"
    },
    {
      "number": "202103317623",
      "type": "otc alterations permit",
      "status": "reinstated",
      "filed": "2021-03-31",
      "status_date": "2026-02-03",
      "estimated_cost": 115000,
      "revised_cost": 115000,
      "description": "three units: relocate kitchen and convert pantry into bathroom, and kitchen into bedroom on all 3 units. window replacement on 2nd, 3rd, 4th flrs in kind. front windows replacement in kind with wood ogee and true dividers.",
      "source": "sf-building-permits"
    },
    {
      "number": "202009275177",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2020-09-27",
      "status_date": "2021-01-22",
      "estimated_cost": 80000,
      "revised_cost": 80000,
      "description": "rev to pa202002073886 & pa201612306363: comply to complaint 201901291-revise foundation & excavate soile at rear of building (approx 126 cy).",
      "source": "sf-building-permits"
    },
    {
      "number": "202002073886",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "2020-02-07",
      "status_date": "2022-06-24",
      "estimated_cost": 40000,
      "revised_cost": 50000,
      "description": "revise pa# 201612306363; revise fondation and sequence",
      "source": "sf-building-permits"
    },
    {
      "number": "M1152007",
      "type": "otc alterations permit",
      "status": "issued",
      "filed": "2019-10-11",
      "status_date": "2019-10-11",
      "revised_cost": 1,
      "description": "street space",
      "source": "sf-building-permits"
    },
    {
      "number": "201803295058",
      "type": "additions alterations or repairs",
      "status": "issued",
      "filed": "2018-03-29",
      "status_date": "2021-03-25",
      "estimated_cost": 80000,
      "revised_cost": 200000,
      "description": "two (n) adu units per ord# 162-17, each w/ 1 bedrm, 1 bath on 1st flr.",
      "source": "sf-building-permits"
    },
    {
      "number": "201708316532",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2017-08-31",
      "status_date": "2017-09-13",
      "estimated_cost": 3000,
      "revised_cost": 3000,
      "description": "comply w/complaint # 201795451 to repair holes in floors at rear structure w/in like material",
      "source": "sf-building-permits"
    },
    {
      "number": "201706199677",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2017-06-19",
      "status_date": "2017-06-27",
      "estimated_cost": 3980,
      "revised_cost": 5000,
      "description": "replace existing aluminum windows with new double pane vinyl windows. all windows located in the back of the bldg. u-0.31, shgc - 0.29.",
      "source": "sf-building-permits"
    },
    {
      "number": "201705237414",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2017-05-23",
      "status_date": "2017-07-10",
      "estimated_cost": 3000,
      "revised_cost": 3000,
      "description": "like for like voluntary fire system replacement withnew control panel, smoket detector, pull station at same location. install radio communicator to communicate with central station. will comply with sffc sec 1103.761 by 2021",
      "source": "sf-building-permits"
    },
    {
      "number": "201612306363",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "2016-12-30",
      "status_date": "2022-06-24",
      "estimated_cost": 80000,
      "revised_cost": 100000,
      "description": "mandatory soft story upgrade per ord 6613 retrofit gr fl per a4 cbc 2013 75%",
      "source": "sf-building-permits"
    },
    {
      "number": "201512235861",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "2015-12-23",
      "status_date": "2016-01-06",
      "estimated_cost": 16700,
      "revised_cost": 16700,
      "description": "reroofing",
      "source": "sf-building-permits"
    },
    {
      "number": "8207684",
      "type": "additions alterations or repairs",
      "status": "complete",
      "filed": "1982-09-20",
      "status_date": "1983-03-04",
      "estimated_cost": 38000,
      "description": "bldg use: apts",
      "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=3421",
      "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=3610049&$order=closed_roll_year%20DESC&$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=3610&lot=049",
      "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=3610049",
      "retrieved": "2026-07-31"
    }
  ]
}