{
  "address": "20 Hartford Street, San Francisco, CA 94114",
  "path": "/san-francisco/castro/hartford-street/20/",
  "hook": "A 1901 house with a 1989 horizontal-addition permit that expired.",
  "apn": "3582038",
  "block": "3582",
  "lot": "038",
  "eas_baseid": "360712",
  "coordinates": {
    "lat": 37.762166,
    "lng": -122.434295
  },
  "parcel": {
    "year_built": 1901,
    "use": "Single Family Residential",
    "property_class": "Dwelling",
    "units": 1,
    "stories": 2,
    "rooms": 6,
    "bathrooms": 2,
    "bedrooms": 3,
    "construction_type_code": "D",
    "lot_area_sqft": 2548,
    "building_area_sqft": 1442,
    "zoning": "RH-3",
    "supervisor_district": 8,
    "assessor_neighborhood": "Eureka Valley/Dolores Heights",
    "analysis_neighborhood": "Castro/Upper Market"
  },
  "assessment": {
    "roll_year": 2025,
    "assessed_land_value": 1656837,
    "assessed_improvement_value": 710073,
    "last_sale_date": "1997-01-31"
  },
  "historic_status": {
    "ceqa_status_code": "A",
    "ceqa_status_code_article_10_11": "A",
    "ceqa_status_label": "Historic resource",
    "reason": "California Register Historic District",
    "yearbuilt": "1901",
    "in_article_10_11_historic_district": false,
    "source": "sf-planning"
  },
  "historic_district": {
    "name": "Hartford Street Historic District",
    "california_register_status": "Eligible (not listed)",
    "national_register_status": "Not listed",
    "article_10_11_status": "No local landmark protection",
    "period_of_significance": "1900-1902",
    "significance_note": "Significant under Criterion 3 for its association with master builder Fernando Nelson, as an early 20th-century Victorian-era residential tract development.",
    "source": "sf-historic-districts"
  },
  "permits": [
    {
      "number": "9825128",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1998-12-09",
      "estimated_cost": 3200,
      "description": "retrofit work shear wall with 1/2 ply sill plate bolting",
      "source": "sf-building-permits",
      "description_edited": "Seismic retrofit — shear wall reinforced with plywood and sill-plate bolting."
    },
    {
      "number": "9606614",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1996-04-17",
      "completed": "1996-05-10",
      "estimated_cost": 515,
      "description": "repair dry rot at rear deck & left rear corner",
      "source": "sf-building-permits",
      "description_edited": "Dry rot repaired at the rear deck and left rear corner."
    },
    {
      "number": "9505935",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1995-04-24",
      "estimated_cost": 1,
      "description": "renew expired permit appn. 9403253",
      "source": "sf-building-permits",
      "description_edited": "Renewal of the expired 1994 kitchen permit, 9403253."
    },
    {
      "number": "9403253",
      "type": "additions alterations or repairs",
      "status": "expired",
      "filed": "1994-03-07",
      "estimated_cost": 45000,
      "revised_cost": 35000,
      "description": "cabinets & appliances in kitchen will be removed & replace",
      "source": "sf-building-permits",
      "description_edited": "Kitchen cabinets and appliances removed and replaced."
    },
    {
      "number": "9315610",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1993-09-10",
      "estimated_cost": 9095,
      "description": "reroofing.",
      "source": "sf-building-permits"
    },
    {
      "number": "9108840",
      "type": "otc alterations permit",
      "status": "expired",
      "filed": "1991-05-20",
      "estimated_cost": 1950,
      "description": "work to comply with sfbc, repair mudsill, repair deck, etc",
      "source": "sf-building-permits",
      "description_edited": "Building-code compliance work — mudsill and deck repaired."
    },
    {
      "number": "8916449",
      "type": "additions alterations or repairs",
      "status": "expired",
      "filed": "1989-09-07",
      "estimated_cost": 40000,
      "description": "horizontal addition",
      "source": "sf-building-permits"
    },
    {
      "number": "8511709",
      "type": "otc alterations permit",
      "status": "complete",
      "filed": "1985-10-16",
      "completed": "1985-11-19",
      "estimated_cost": 740,
      "description": "installation of aluminum windows",
      "source": "sf-building-permits",
      "description_edited": "Aluminum windows installed."
    }
  ],
  "permits_omitted": {
    "count": 2,
    "reason": "nominal $1 street-space/sidewalk permits",
    "numbers": [
      "M119516",
      "M403369"
    ]
  },
  "sources": [
    {
      "id": "sf-eas-addresses",
      "name": "SF Enterprise Addressing System via DataSF",
      "query": "https://data.sfgov.org/resource/3mea-di5p.json?street_name=HARTFORD&street_type=ST&address_number=20",
      "retrieved": "2026-07-27"
    },
    {
      "id": "sf-assessor-roll",
      "name": "SF Office of the Assessor-Recorder via DataSF (2025 secured roll)",
      "query": "https://data.sfgov.org/resource/wv5m-vpq2.json?parcel_number=3582038&$order=closed_roll_year%20DESC&$limit=1",
      "retrieved": "2026-07-27"
    },
    {
      "id": "sf-building-permits",
      "name": "SF Dept. of Building Inspection via DataSF",
      "query": "https://data.sfgov.org/resource/i98e-djp9.json?block=3582&lot=038",
      "retrieved": "2026-07-27"
    },
    {
      "id": "sf-planning",
      "name": "SF Planning Department — Historic Resource Status by Parcel via DataSF",
      "query": "https://data.sfgov.org/resource/3tsw-4idn.json?apn=3582038",
      "retrieved": "2026-07-27"
    },
    {
      "id": "sf-historic-districts",
      "name": "SF Planning Department — Historic Districts via DataSF",
      "query": "https://data.sfgov.org/resource/63x5-g3m4.json?$where=intersects(the_geom,%20%27POINT(-122.43429541905336%2037.76216616142257)%27)",
      "retrieved": "2026-07-27"
    },
    {
      "id": "eureka-valley-context-statement",
      "name": "Elaine B. Stiles, Eureka Valley Historic Context Statement, prepared for the Eureka Valley Neighborhood Association, adopted by the Historic Preservation Commission December 20, 2017",
      "query": "http://default.sfplanning.org/Preservation/EurekaValleyHCS/hp_eureka_valley_hcs_HCS_FINAL-122017.pdf",
      "listing": "https://sfplanning.org/project/sf-histories-historic-context-statements#completed",
      "label": "Eureka Valley Historic Context Statement, adopted 2017",
      "retrieved": "2026-08-14"
    }
  ],
  "historic_survey": {
    "survey": "Eureka Valley Historic Context Statement (2017)",
    "source": "eureka-valley-context-statement",
    "style": "Queen Anne, some altered",
    "year_built_as_surveyed": "1901-1902",
    "address_as_surveyed": "20-64 Hartford Street",
    "note": "Listed among the houses Fernando Nelson built in Eureka Valley. The statement is reconnaissance-level and says inclusion in it is not a judgement on a building's worthiness for preservation. It records the row as single-storey end-gable dwellings with entry porch and bay window, and names Nelson's Hartford Street houses as a concentration of developer housing worth studying as a potential historic district. The recommendations print the range as 2-64 Hartford; the builder table prints it as 20-64."
  },
  "building": {
    "builder": "Fernando Nelson"
  }
}