770 Union Street, Brooklyn, NY 11215

The 9-unit, 4-story tenement building at 770 Union Street in Park Slope, owned by Nicholas Kotsonis, has experienced recurring heating system issues in early 2025, with complaints about heat and hot water (both entire building and apartment-specific) filed in February and January, though these were reportedly resolved. The property has documented multiple maintenance concerns in 2024, particularly between April and July, including problematic window frames, paint/plaster issues on walls and ceilings, and a series of other violations primarily affecting apartments 2 and 5.

In 2024, significant violations were identified in apartment 5, including mold issues, problems with floor tiles, and smoke detector concerns, while apartment 2 had various maintenance deficiencies including plaster and paint issues. A building vibration complaint was filed and inspected in February 2024, but no violations were found at that time.

The building's pest management record shows no bedbug infestations reported in recent years, with consistent zero counts in annual filings from 2021 to 2025. However, there have been multiple rodent activity reports between 2022 and 2023, with inspections in January and March 2022 noting rat activity, and similar findings in March 2023.