21 Claremont Avenue
Building overview
Data as of Jul 1, 2026
Based on open violations, 311 complaint patterns, and amenities.
Compared to typical rent for this neighborhood and bedroom count.
Highlights
What's great about this place
- Pre-war characterBuilt in 1910
Things to Know
Real considerations before you sign
- Significant issues across building dataSee violation history below for details
About this building
A 10-story building located in Morningside Heights, containing 47 residential units. Built in 1910.
The neighborhood: Morningside Heights
Manhattan · 449 buildings tracked
Median asking rent: $5,509 1BR · $5,999 2BR
2 subway stations nearby
2 parks · 0.3 acres · incl. Old Croton Aqueduct Gatehouse
Available Units
0 active
No past listings.
Past and off-market units will appear here when data is available.
Safety & Violations
Safety Record
Active Violations
Higher than typical for this neighborhood (14 vs 2 average per building).
Top issues
- Lead Paint4
- Structural4
- Pests2
Severity Key
- Class C: Immediately Hazardous (Major)
- Class B: Hazardous (Moderate)
- Class A: Non-Hazardous (Minor)
- Window/Door
THE BROKEN OR DEFECTIVE APRON OF WINDOW NORTH ROOM 6 STY NORTHWEST APT 64 , SECTION '' ''
Sep 24, 2009Class B - Safety
ADM CODE ARRANGE AND MAKE SELF-CLOSING THE DOORS ENTRANCE TO 10 STY NORTHEAST APT 101. , SECTION '' ''
Sep 24, 2009Class B - Safety
OR REPLACE THE SMOKE DETECTOR MISSING 10 STY NORTHEAST APT 101 BRANNER. , SECTION '' ''
Sep 24, 2009Class B - Pests
VERMIN ROCHES AT KITCHEN 10 STY NORTHEAST APT 101. , SECTION '' ''
Sep 24, 2009Class B - Structural
THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN A UNIFORM COLOR EAST WALL & CEILING EAST OF FRONT NORTH ROOM 10 STY SOUTHEAST APT 102. , SECTION '' ''
Sep 24, 2009Class B
Market Value Estimate
Statistical estimate based on publicly available listing data. Not an appraisal. See disclaimer.Market data as of Jul 1, 2026.
Comp Matrix
| Unit Type | This Bldg | Area Avg | Diff. |
|---|---|---|---|
| Studio | — | $2,600 | — |
| 1 Bed | — | $5,509 | — |
| 2 Bed | — | $5,999 | — |
| 3+ Bed | — | $4,999 | — |
Value Verdict
Insufficient listing or market data to compute a verdict for this building.
Rent vs. Buy Analysis
No listing data available to estimate rent vs. buy.
Management & Operations
Management & Performance
Owner/Operator
TRUSTEES OF COLUMBIA UNIVERSITY
Responsiveness Score
Average time to resolve violations
Similar to NYC average (45 days)
We haven't verified this building's policies yet. Pet, utility, and leasing details appear here once we've reviewed the management company's official site — we only show policies we can source, never assumptions.
Living here — quick answers
Every answer comes from public records for this specific building — we skip questions we can't answer with data.
- How well maintained is this building?
- There are 14 open HPD violations on record, none in the city's most serious category (Class C). That's higher than typical for the neighborhood (2 average per building).
- Is this building rent-stabilized?
- Yes — this building appears on the DHCR rent-stabilized building list. Ask the landlord to confirm whether a specific apartment is stabilized.
- How noisy is this building?
- Neighbors filed 2 noise complaints with 311 in the past year, about the neighborhood median of 2.
- How responsive is management to problems?
- Resolved violations at this building closed in about 50 days on average (NYC average is roughly 45 days). Open items are listed in the Safety & Violations section above.
- What does it cost to live here?
- We don't have current listings for this building. Typical asking rent in Morningside Heights is about $5,509/month for a one-bedroom.