509 West 121st Street
Class B
Class C
12 months to Aug 2026
rent-stabilized with
DHCR (most recent year)
units (PLUTO)
12 months through June 2026
rent
min walk
(311 complaints)
errands grade
nearby
Top insights
- 5 open hazardous (Class C) violations
- Built before 1939 (city records: 1911) — likely subject to NYC lead-paint rules
About this building
City records list 1911 as the year built — newer than 77% of the 1,388 buildings we cover in ZIP 10027. The building’s floor space is 5.6 times the size of its lot: 81,632 sq ft of building on a 14,525 sq ft lot. 110 apartments — more than 97% of the 1,386 residential buildings we cover in ZIP 10027 have.
Comparisons with neighboring buildings, as of November 7, 2026.
509 West 121st Street
Open in Google Street View ↗
- City records show 5 open HPD violations, 5 immediately hazardous (Class C) at this building. Ask which are still unresolved in the unit and the landlord’s timeline to clear them.
- The oldest open violation on record dates to 1999 — why has it stayed open this long, and is it in or near this unit?
- We found no DHCR rent-stabilization unit count for this building. That is not the same as the building being market-rate — a registration can be on file with no unit figure, or not have been filed at all. Ask the landlord directly whether the unit is rent-stabilized, and request your own rent history from DHCR.
- City Buildings Department records show an open life-safety condition (e.g. unsafe building / hazardous facade) — what is it, and has it actually been resolved, not just re-filed?
- Confirm the condition behind the most recent open violation was actually repaired, not just marked closed: Correct the lead-based paint hazard - presumed lead paint that is peeling or….
- Confirm in person that the immediately-hazardous (Class C) conditions — typically heat, hot water, leaks, mold or pests — are genuinely fixed, not just marked closed.
509 West 121st Street sits in Manhattan, ZIP 10027. The closest subway is 116 St-Columbia University (1) (6-minute walk), served by the 1 line.
Building Condition
Oldest open violation: August 1999 · Most recent: March 2003. HPD marks a violation open until it is certified as corrected, so an old date can mean an unresolved condition or a repair that was never certified.
- 2003-03-16
- 2003-03-16
- 2003-03-16
- 1999-08-19
- 1999-08-19
- Class C · 5 open · penalty 75 · (15/ea)
- 2026-01-30 · Apt 3C · EMERGENCY · HEAT/HOT WATER
- 2025-12-11 · Apt BLDG · EMERGENCY · HEAT/HOT WATER
- 2025-05-22
- 2022-02-22 "CYCLE 9A FAILURE TO CORRECT SWARMP CONDITIONS"
- 2022-02-22 "CYCLE 9A UNSAFE REPORT FILED"
- 2021-04-29 "FAILURE TO DISPLAY ENERGY EFFICIENCY SCORE AND ENERGY EFFICIENCY GRADE AS PER ADCODE SEC. 28-309.12.3"
No HPD lead-paint violations are on record for this building. That means no complaint or inspection was filed — not that the building is lead-free.
Built 1911. Under NYC Local Law 1 (Admin Code §27-2056.5), lead paint is presumed present in common areas and in apartments where a child under 6 resides, in multiple dwellings built before 1960. The presumption stands unless the owner obtained a lead-free or lead-safe exemption from HPD. Those exemption records aren’t published as open data, so we can’t confirm one either way.
The Building
Neighborhood & Environment
~1 block 300m
~2-3 blocks
- PETIT LARCENY: 44
- HARRASSMENT 2: 43
- GRAND LARCENY: 39
- ASSAULT 3 & RELATED OFFENSES: 18
- CRIMINAL MISCHIEF & RELATED OF: 16
- HEAT/HOT WATER: 98
- Traffic Signal Condition: 57
- UNSANITARY CONDITION: 54
- Noise - Residential: 35
- DOOR/WINDOW: 31
- 532 SEMINARY ROW
- 1225 AMSTERDAM AVE
- 3060 BROADWAY
- P.S. 036 Margaret Douglas
- P.S. 125 Ralph Bunche
- P.S. 180 Hugo Newman
- Columbia Secondary School
- P.S. 180 Hugo Newman
- New York French American Charter School
- Columbia Secondary School
- New York French American Charter School
- 116 St-Columbia University
- 125 St
- 125 St
- Grade A
- Grade A
- Grade A
- Grade A
- Grade A
- Grade A
- Grade A
- Grade A
- Kipp Beyond Charter School
- Innovative Charitable Initiative, Inc.
- Columbia University
- New York French-American Charter School
- George Bruce Library
- Union Theological Seminary
Internet providers serving this area
Internet providers available in this area — including fiber:
- Astound Broadband Cable Up to 1,500 Mbps down · 50 Mbps up
- Spectrum Cable Up to 1,000 Mbps down · 50 Mbps up
- Verizon Fiber Up to 980 Mbps down · 880 Mbps up
How to check internet providers before signing an NYC lease →
Source: FCC Broadband Data Collection (NY, rev. May 2026). Wired broadband only — cable + fiber. DSL, satellite, and fixed-wireless not included. Block-level data; actual availability may vary by building.
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