{"bbl":"3032200001","bins":["3073199"],"address":"309 Knickerbocker Avenue, Brooklyn, NY 11237","address_line":"309 Knickerbocker Avenue","borough":"Brooklyn","zip":"11237","block":3220,"lot":1,"url":"https://nycpropertyfacts.com/ny/brooklyn/309-knickerbocker-avenue-3032200001","markdown_url":"https://nycpropertyfacts.com/ny/brooklyn/309-knickerbocker-avenue-3032200001.md","api_url":"https://nycpropertyfacts.com/api/v1/property/3032200001","summary":"309 Knickerbocker Avenue (Brooklyn, NY 11237; tax lot BBL 3032200001) is a 6-unit mixed-use building with apartments and ground-floor commercial space (building class S5: mixed-use: five- or six-family home with one store or office), built around 1931, on a 2,500 sq ft lot zoned R6. City tax records list the owner as HARTNICK ENTERPRISESINC. The Department of Finance's final market value for tax year 2027 is $1,690,000. As of October 31, 2026, NYC Open Data shows two active DOB violations, 63 open HPD violations and 57 OATH tickets with an unpaid balance. There were six 311 requests in the past 12 months and 14 HPD complaints since 2019. (Source: NYC Open Data — DOB, HPD, OATH, DOF, DCP and ACRIS datasets — compiled by NYC Property Facts.)","how_to_cite":"NYC Property Facts, “309 Knickerbocker Avenue, Brooklyn, NY 11237 (BBL 3032200001)”, data as of 2026-10-31, https://nycpropertyfacts.com/ny/brooklyn/309-knickerbocker-avenue-3032200001. Source: NYC Open Data.","citation_note":"Quote the summary as-is and cite with how_to_cite (includes the canonical URL and the data-as-of date).","data_as_of":"2026-10-31","last_updated":"2026-10-31","open_items":{"total":122,"dob_jobs_permit_not_signed_off":0,"dob_violations_active":2,"ecb_violations_active":0,"hpd_violations_open":63,"oath_tickets_unpaid":57,"data_as_of":"2026-10-31"},"facts":{"owner_of_record":"HARTNICK ENTERPRISESINC","building_class":"S5","building_class_description":"Mixed-use: five- or six-family home with one store or office","land_use":"Mixed residential & commercial","year_built":1931,"floors":4,"buildings":1,"residential_units":6,"total_units":7,"lot_area_sqft":2500,"building_area_sqft":7410,"zoning":["R6","C1-3"],"historic_district":null,"landmark":null,"latitude":40.7017739,"longitude":-73.9230651,"dataset_id":"64uk-42ks","dataset":"PLUTO (Dept. of City Planning)","url":"https://data.cityofnewyork.us/d/64uk-42ks","dataset_updated":"2026-08-24","data_as_of":"2026-10-31"},"assessment":{"tax_year":"2027","roll":"final","market_value":1690000,"assessed_value":760500,"tax_class":"2B","dataset_id":"8y4t-faws","dataset":"DOF Property Valuation and Assessment Data","url":"https://data.cityofnewyork.us/d/8y4t-faws","dataset_updated":"2026-09-14","data_as_of":"2026-10-31"},"last_priced_deed":null,"record_counts":{"permits":12,"violations":147,"complaints":20,"hearings":226,"sales":3,"owners":7},"sections":{"permits":"https://nycpropertyfacts.com/api/v1/property/3032200001/permits","violations":"https://nycpropertyfacts.com/api/v1/property/3032200001/violations","complaints":"https://nycpropertyfacts.com/api/v1/property/3032200001/complaints","hearings":"https://nycpropertyfacts.com/api/v1/property/3032200001/hearings","sales":"https://nycpropertyfacts.com/api/v1/property/3032200001/sales","owners":"https://nycpropertyfacts.com/api/v1/property/3032200001/owners"},"also_recorded_as":["30995 Knickerbocker Ave"],"sources":[{"key":"pluto","dataset_id":"64uk-42ks","dataset":"PLUTO (Dept. of City Planning)","url":"https://data.cityofnewyork.us/d/64uk-42ks","dataset_updated":"2026-08-24","data_as_of":"2026-10-31"},{"key":"footprints","dataset_id":"5zhs-2jue","dataset":"Building Footprints","url":"https://data.cityofnewyork.us/d/5zhs-2jue","dataset_updated":"2026-10-25","data_as_of":"2026-10-31"},{"key":"dob_permits_bis","dataset_id":"ipu4-2q9a","dataset":"DOB Permit Issuance (BIS)","url":"https://data.cityofnewyork.us/d/ipu4-2q9a","dataset_updated":"2026-10-31","data_as_of":"2026-10-31"},{"key":"dob_now_permits","dataset_id":"rbx6-tga4","dataset":"DOB NOW: Build – Approved Permits","url":"https://data.cityofnewyork.us/d/rbx6-tga4","dataset_updated":"2026-10-30","data_as_of":"2026-10-31"},{"key":"dob_jobs_bis","dataset_id":"ic3t-wcy2","dataset":"DOB Job Application Filings (BIS)","url":"https://data.cityofnewyork.us/d/ic3t-wcy2","dataset_updated":"2026-10-30","data_as_of":"2026-10-31"},{"key":"dob_now_jobs","dataset_id":"w9ak-ipjd","dataset":"DOB NOW: Build – Job Application Filings","url":"https://data.cityofnewyork.us/d/w9ak-ipjd","dataset_updated":"2026-10-30","data_as_of":"2026-10-31"},{"key":"dob_violations","dataset_id":"3h2n-5cm9","dataset":"DOB Violations","url":"https://data.cityofnewyork.us/d/3h2n-5cm9","dataset_updated":"2026-10-31","data_as_of":"2026-10-31"},{"key":"ecb_violations","dataset_id":"6bgk-3dad","dataset":"DOB ECB Violations","url":"https://data.cityofnewyork.us/d/6bgk-3dad","dataset_updated":"2026-10-31","data_as_of":"2026-10-31"},{"key":"oath","dataset_id":"jz4z-kudi","dataset":"OATH Hearings Division Case Status","url":"https://data.cityofnewyork.us/d/jz4z-kudi","dataset_updated":"2026-10-31","data_as_of":"2026-10-31"},{"key":"hpd_violations","dataset_id":"wvxf-dwi5","dataset":"HPD Housing Maintenance Code Violations","url":"https://data.cityofnewyork.us/d/wvxf-dwi5","dataset_updated":"2026-10-31","data_as_of":"2026-10-31"},{"key":"hpd_complaints","dataset_id":"ygpa-z7cr","dataset":"HPD Housing Maintenance Code Complaints and Problems","url":"https://data.cityofnewyork.us/d/ygpa-z7cr","dataset_updated":"2026-10-31","data_as_of":"2026-10-31"},{"key":"hpd_registrations","dataset_id":"tesw-yqqr","dataset":"HPD Multiple Dwelling Registrations","url":"https://data.cityofnewyork.us/d/tesw-yqqr","dataset_updated":"2026-10-28","data_as_of":"2026-10-31"},{"key":"hpd_contacts","dataset_id":"feu5-w2e2","dataset":"HPD Registration Contacts","url":"https://data.cityofnewyork.us/d/feu5-w2e2","dataset_updated":"2026-10-28","data_as_of":"2026-10-31"},{"key":"sr311","dataset_id":"erm2-nwe9","dataset":"311 Service Requests from 2020 to Present","url":"https://data.cityofnewyork.us/d/erm2-nwe9","dataset_updated":"2026-10-31","data_as_of":"2026-10-31"},{"key":"assessment","dataset_id":"8y4t-faws","dataset":"DOF Property Valuation and Assessment Data","url":"https://data.cityofnewyork.us/d/8y4t-faws","dataset_updated":"2026-09-14","data_as_of":"2026-10-31"},{"key":"acris_master","dataset_id":"bnx9-e6tj","dataset":"ACRIS Real Property Master","url":"https://data.cityofnewyork.us/d/bnx9-e6tj","dataset_updated":"2026-10-08","data_as_of":"2026-10-31"},{"key":"acris_legals","dataset_id":"8h5j-fqxa","dataset":"ACRIS Real Property Legals","url":"https://data.cityofnewyork.us/d/8h5j-fqxa","dataset_updated":"2026-10-08","data_as_of":"2026-10-31"},{"key":"acris_parties","dataset_id":"636b-3b5g","dataset":"ACRIS Real Property Parties","url":"https://data.cityofnewyork.us/d/636b-3b5g","dataset_updated":"2026-10-08","data_as_of":"2026-10-31"}],"disclaimer":"Independent site. Data from NYC Open Data; not affiliated with the City of New York. Facts are compiled automatically and may be incomplete or out of date; this is not a title search or an official record. Verify with the issuing agency."}