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517 East 81st Street

Manhattan · Upper East Side-Yorkville, NY 10028

517 East 81st Street is a 10-apartment building in Upper East Side-Yorkville, built in 1914, managed by Black Diamond Equity Management INC. The City has 19 open housing-code violations on file for it, 3 of them immediately hazardous, about 1.9 per apartment, roughly three times the neighborhood norm for a building this size (HPD, as of 5 October 2026). No tenant has reviewed it here yet. Everything above comes from the City's own records.

Managed by Black Diamond Equity Management INC.

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Units
10
Year built
1914
Borough
Manhattan

This building’s record with the City

Complaints tenants filed with 311, and repairs a City inspector has asked for. Most repairs are routine maintenance. Both describe the building rather than the people in it, and often predate the current management.

2.0/5Worse than most nearbyScored from the records below against every building we cover. It is not a tenant rating. Nobody who lived here said this.

0tenant complaints

Filed with 311 in the past year

19open repairs

Outstanding with HPD · about 1.9 per apartment

Immediately hazardous
3
Hazardous
14
Non-hazardous
2

What the open repairs are about

  • Pests5
  • Smoke and CO alarms5
  • Other repairs3
  • Doors, windows and locks3
  • Stairs, floors and ceilings2
  • Paint and plaster1

Source: NYC 311 and Housing Preservation & Development. Look this building up · updated Oct 2026

The company that manages it, elsewhere

Black Diamond Equity Management INC manages 10 other buildings we cover, holding 199 apartments.

open violations
146open violations
immediately hazardous
53immediately hazardous
311 complaints
51311 complaints

in the past year

per apartment
0.7per apartment

The company’s record across its other buildings, not this building’s. A company can run one well and another badly, and these figures often predate the current management. (HPD and 311, as of 5 October 2026.)

What tenants say

Nobody has written about 517 East 81st Street yet.

Does the heat hold in January? How long does the super take? Does management answer the phone, and were you charged what you expected? No public record answers any of that. Only someone who lived here can.

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