439 East 21st Street, Brooklyn, NY 11226

439 East 21st Street in Flatbush is a 3-story, 4-unit residential building constructed in 1965, currently owned by Abraham Post. The property has experienced recurring issues with water supply and heating systems, particularly evident in 2022-2025, with multiple complaints about inadequate heat/hot water affecting the entire building, including inspections in February 2025 that resulted in violations. The building's plumbing infrastructure has been problematic, with violations and complaints about water supply issues in 2022-2024, including an open violation as of April 2024 regarding inadequate cold water supply in Apartment 3.

There are significant concerns regarding the building's conversion status, with multiple active Environmental Control Board violations (from August 2023) alleging illegal conversion of a former doctor's office to residential use on the first floor, with penalties totaling $25,000. This follows a July 2023 Department of Buildings complaint about illegal conversion, and a 2021 violation regarding improper drainage that resulted in a penalty. The building has faced several maintenance challenges, including unsanitary conditions such as pest infestations and sewage problems documented in 2023, with violations issued.

Multiple Housing Maintenance Code violations have been recorded, including issues with carbon monoxide detectors and hot water temperature in Apartment 3 in late 2022, though some have been resolved. The property appears to have maintained a pest-free environment in recent years, with no bedbug reports in the past three years (2022-2025). While historical records show rodent inspection results from 2013, these are now dated and not necessarily indicative of current conditions. The building's recent history suggests ongoing infrastructure and maintenance challenges, particularly regarding water systems and heating, with unresolved violations related to both building safety and proper occupancy.