{ "address": "3820 21st Street, San Francisco, CA 94114", "path": "/san-francisco/castro/21st-street/3820/", "apn": "3603010", "block": "3603", "lot": "010", "eas_baseid": "361921", "coordinates": { "lat": 37.756437, "lng": -122.432913 }, "parcel": { "year_built": 1905, "units": 1, "stories": 2, "rooms": 6, "bathrooms": 1, "lot_area_sqft": 2848, "building_area_sqft": 1450, "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": "Castro/Upper Market", "property_location_raw": "0000 3820 21ST ST0000" }, "assessment": { "roll_year": 2025, "assessed_land_value": 33466, "assessed_improvement_value": 91002 }, "historic_status": { "ceqa_status_code": "A", "ceqa_status_code_article_10_11": "A", "ceqa_status_label": "Historic resource", "reason": "California Register Historic District", "yearbuilt": "1905", "in_article_10_11_historic_district": false, "source": "sf-planning" }, "historic_district": { "name": "Castro & Liberty Streets Historic District", "california_register_status": "Eligible (not listed)", "national_register_status": "Not listed", "article_10_11_status": "No local landmark protection", "local_landmark_protection": false, "period_of_significance": "1897–1906", "source": "sf-historic-districts" }, "permits": [ { "number": "201407020345", "type": "otc alterations permit", "status": "complete", "filed": "2014-07-02", "status_date": "2014-08-08", "estimated_cost": 28030, "revised_cost": 28030, "description": "tear off existing composition shibgles to wood shingles or sheeting. apply new 40 year class a fiberglass shibgles with #15 or #30 felt underlayment. install new metal edge flashings, pipe and flue jacks, wall step flashings and hip and ridge shingles.", "source": "sf-building-permits" }, { "number": "M71490", "type": "otc alterations permit", "status": "issued", "filed": "2007-06-04", "status_date": "2007-06-04", "revised_cost": 0, "description": "sidewalk permit", "source": "sf-building-permits" }, { "number": "200705252254", "type": "otc alterations permit", "status": "complete", "filed": "2007-05-25", "status_date": "2007-07-18", "estimated_cost": 1200, "revised_cost": 1200, "description": "replace upper and lower sash in 2 bedroom wndw (30\"x76\") at the rear of house", "source": "sf-building-permits" }, { "number": "9716914", "type": "otc alterations permit", "status": "complete", "filed": "1997-09-02", "status_date": "1997-10-31", "estimated_cost": 4000, "description": "replace sidewall shingles at front of house/rpr siding also.", "source": "sf-building-permits" }, { "number": "8902668", "type": "otc alterations permit", "status": "complete", "filed": "1989-02-16", "status_date": "1989-06-26", "estimated_cost": 8095, "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=21ST&street_type=ST&address_number=3820", "retrieved": "2026-07-28" }, { "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=3603010&$order=closed_roll_year%20DESC&$limit=1", "retrieved": "2026-07-28" }, { "id": "sf-building-permits", "name": "SF Dept. of Building Inspection via DataSF", "query": "https://data.sfgov.org/resource/i98e-djp9.json?block=3603&lot=010", "retrieved": "2026-07-28" }, { "id": "sf-planning", "name": "SF Planning Department — Historic Resource Status by Parcel via DataSF", "query": "https://data.sfgov.org/resource/3tsw-4idn.json?apn=3603010", "retrieved": "2026-07-28" }, { "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(-122.43291263430181%2037.75643658059205)%27)", "retrieved": "2026-07-28" }, { "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", "year_built_as_surveyed": "1903-1904 / 1905", "address_as_surveyed": "3816 to 3836 21st Street", "note": "Listed among the houses the builder John (or Jonathan) Anderson put up in Eureka Valley; the statement gives his signature detail as an urn of flowers at the outer edges of the second-storey wall beneath the gable. The statement is reconnaissance-level and says inclusion in it is not a judgement on a building's worthiness for preservation. It counts fourteen 1.5-storey end-gable dwellings with bay window and entry porch in the group and names it as a concentration of developer housing worth studying as a potential historic district. Illustrated in the statement's survey of Eureka Valley property types and architectural styles. The statement is reconnaissance-level and says inclusion in it is not a judgement on a building's worthiness for preservation. It records it as a 1.5-storey end-gable dwelling with porch and bay window; the statement also counts this number in John Anderson's row of 1903-1904 at 3816 to 3836 21st Street." }, "building": { "builder": "John Anderson" } }