645 Main Street
Building overview
Data as of Apr 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
- Quieter than average for the neighborhood0 noise complaints in past year (vs 3 median)
Things to Know
Real considerations before you sign
No flagged considerations from public records — verify with a tour.
About this building
A 18-story building located in Upper East Side-Lenox Hill-Roosevelt Island, containing 8018 residential units. Built in 1975.
Available Units
6 active · 9 past listings
Safety & Violations
No Open Violations on Record
This building has a clean record with HPD and DOB as of today.
Market Value Estimate
Statistical estimate based on publicly available listing data. Not an appraisal. See disclaimer.Market data as of Apr 1, 2026.
Comp Matrix
| Unit Type | This Bldg | Area Avg | Diff. |
|---|---|---|---|
| Studio | $3,435 | $3,655 | -6% |
| 1 Bed | $4,452 | $3,495 | +27% |
| 2 Bed | $5,577 | $5,757 | -3% |
| 3+ Bed | $7,284 | $7,344 | -1% |
Value Verdict
Premium
Rents are 44% higher than the neighbourhood average.
Rent vs. Buy Analysis
Rent
$5,029
Building Avg
Buy
$6,890
Est. Monthly Carry
Renting Saves ~$22,332/yr
Compared to buying a similar unit in this neighbourhood.
How is this calculated?+
Estimated monthly carry is the building's average rent multiplied by 1.37x — a rough heuristic for what an equivalent purchase would cost per month. The 1.37 figure approximates principal + interest on a 20% down loan at 6-7% mortgage rates, plus typical NYC property taxes, homeowner insurance, and maintenance reserves.
Annual savings is the difference between this estimated monthly carry and the building's average rent, multiplied by 12.
This is an approximation, not a per-building mortgage calculation. A full rent-vs-buy calculator with explicit inputs (down payment, rate, taxes, appreciation) is on the roadmap. See accuracy disclaimer.
Management & Operations
Management & Performance
Owner/Operator
RIVERWALK 8 AFFORDABLE, L.P.
0 violations on record. Nothing for management to resolve in our visibility window — responsiveness can't be measured because there's no work to measure.
Pet, climate, connectivity & leasing policies coming in a future update.
Pet Policy
Pet Friendly
Case-by-case approval
Climate
Steam Heat
Landlord pays heat/water
Connectivity
Fios & Spectrum
High-speed available
Leasing
Guarantors OK
Flexible approval