257 West End Avenue, Manhattan, NY 10023

The 6-story, 34-unit residential building at 257 West End Avenue in the Upper West Side, owned by Mark Nathanson and constructed in 1942, has experienced significant pest management challenges in recent years. Most notably, the building has undergone three rodent infestation periods in 2021 (August), 2020 (July), and most recently in July 2025, with the most recent inspection showing rat activity.

While regular bedbug reporting has been consistently maintained from 2019 through 2024, with all reports showing zero infested or eradicated units, there was a Housing Maintenance Code violation recorded in March 2023 related to the late filing of the annual bedbug report, though this appears to have been resolved as subsequent filings have been timely. The building has undergone various construction and maintenance work as evidenced by multiple permits issued between 2018 and 2019, including plumbing, electrical, and exterior work.

Between 2018 and 2021, regular rodent inspections showed a mix of passed and failed results, with particular attention needed to the pattern of failures in 2021. More recent rodent inspections in 2023 (September) and 2024 (August) passed, suggesting some improvement, though the July 2025 inspection indicating rat activity raises concerns about ongoing pest management challenges. The building's documented history shows consistent compliance with bedbug reporting requirements since the violation in 2023, though the fact that the building has had both rodent activity and bedbug reporting issues suggests ongoing challenges with maintaining optimal living conditions.