Under Contract – Backup offers may be accepted
521 Park Avenue #10A
MLS® #RLS20052867
Listing by Compass
- 1
- Bedroom
- 1.5
- Baths
- 1,000
- Sq. Ft.
- 1912
- Year Built
Quick Summary
Property Highlights
- Character: Pre-war building (1912)
Property Details
Listing History
| Event | Date | Price | Change |
|---|---|---|---|
| Listed | Oct 6, 2025 | $1,800,000 | - |
| Currently | Aug 24, 2026 | $1,650,000 | -8.3% |
Description
Loft-Like Prewar Condominium on Park Avenue Rarely available, this sun-flooded 1-bedroom, 1.5-bath residence sits on a high floor of one of Park Avenue’s most distinguished prewar condominiums. Spanning approximately 1,000 sqft, the home is defined by its soaring 10’8” ceilings, oversized windows, and open city views that create a bright, airy, and loft-like atmosphere. The gracious layout features a spacious living and dining area with excellent proportions, ideal for both entertaining and everyday living. With its scale and flexibility, the residence can be easily reimagined as a comfortable two-bedroom home, offering exceptional versatility. The private wing includes a generous bedroom suite with excellent closet space, an en suite bath, and an additional powder room. A windowed kitchen adds to the home’s appeal, enhancing both functionality and natural light throughout. 521 Park Avenue is a white-glove prewar condominium offering 24-hour doorman, porter, handyman, live-in resident manager, and fitness center, with laundry and private storage in the basement. Pets, pied-à-terres, and flexible financing are welcome. Ideally located near Central Park, Madison and Fifth Avenue shopping, and world-class dining, this address offers the very best of Manhattan living. Currently the unit does not have a washer/dryer, but it has been approved by the building and easy to install.
Features & Amenities
Interior Features
Building Amenities
Building Information
Financial Details
About Lenox Hill
View All Lenox Hill ListingsLenox Hill occupies a residential section of the Upper East Side, defined by proximity to Central Park, major medical institutions (Memorial Sloan Kettering, Weill Cornell, Lenox Hill Hospital), and the Madison Avenue retail corridor. Housing stock ranges from large pre-war cooperatives to modern condominiums with East River and skyline views.
Lenox Hill Live Market Data
View NeighborhoodActive Listings
424
Median Asking Price
$1.44M
Median $/Sqft
$1,500
Avg Days on Market
N/A
New This Week
8
Price Reduced
38%
Sold (30 Days)
47
Median Sale Price
$1000K
Live data from RLS at REBNY • Updated 8/23/26, 9:52 PM EST
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Location
521 Park Avenue #10A, Lenox Hill, New York County
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Floor Plans
Building Information
Official NYC property records for this building
Tax & Assessment
Note: Individual unit taxes may differ. Verify current tax bills with NYC DOF.
Source: NYC PLUTO (Primary Land Use Tax Lot Output), NYC Department of City Planning (data.cityofnewyork.us)
Want help estimating ownership costs or understanding building compliance? Let's discuss
Listing Data
RLS® at REBNY (Real Estate Board of New York) via Trestle API. Updated in real-time.
Building Data
NYC PLUTO (Primary Land Use Tax Lot Output), NYC Department of City Planning. Updated quarterly.
Market Data
RLS® at REBNY (Real Estate Board of New York). Live data updated in real-time.
Map & Location
OpenStreetMap contributors via Leaflet. Geocoding via Nominatim.
All data is provided for informational purposes only and should be independently verified. See our Data Sources Policy for more information.
Frequently Asked Questions
Common questions about this property
The current listed common charges are $2,619 per month. Confirm the exact amount with Milton Coste before making an offer.
The current listed annual property tax is $11,664, or roughly $972 per month. Verify the current assessment with your attorney before closing.
This property has 1 bedroom and 1 full bathroom and 1 half bathroom.
The listed interior living area is 1,000 square feet. Verify dimensions independently during due diligence.
According to MLS records, the building was constructed in 1912, making it approximately 114 years old.
This listing is a condominium. Buyers receive a deed to their individual unit and own their space outright, subject to condo association rules.
Pets are permitted at this property. Contact Milton Coste for weight limits or breed restrictions.
At the current list price of $1,650,000 for 1,000 sq ft, the asking price per square foot is approximately $1,650. This figure is for reference only and may differ from appraised or assessed values.
To schedule a private showing, contact Milton Coste at (917) 416-7433 or [email protected]. Per REBNY guidelines effective 2025, a Buyer Representation Agreement is required before a buyer's broker can show you properties. You may attend open houses independently without one.
Have a question not answered here?
(917) 416-7433Listing Courtesy of Compass - Alexandra Hedaya
Listing Contact: (917) 251-7061
Listing information for certain New York City properties provided courtesy of the Real Estate Board of New York's Residential Listing Service (the "RLS"). The information contained in this listing has not been verified by the RLS and should be verified by the consumer. The listing information provided here is for the consumer's personal, non-commercial use. Retransmission, redistribution or copying of this listing information is strictly prohibited except in connection with a consumer's consideration of the purchase and/or sale of an individual property. This listing information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity in the market. ©2026 The Real Estate Board of New York, Inc., all rights reserved. This advertisement does not suggest that the broker has a listing in this property or properties or that any property is currently available.
Broker Commission Disclosure: Broker commissions are not set by law and are fully negotiable.
Buyer Notice: Planning to work with a buyer's broker? A Buyer Representation Agreement is required before your broker can show you properties, per REBNY/UCBA guidelines (effective 2025). You may attend open houses independently without one.
RLS Data display by Keller Williams NYC. Data last updated on 8/24/2026 at 1:52 AM UTC
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Quick Facts
Monthly Costs Estimate
$330,000
Source: Freddie Mac PMMS
Est. Monthly Payment
$0
Estimates only. Consult a lender for exact figures.
Mansion tax applies at this price point
New York State charges the buyer a mansion tax on residential purchases at $1,000,000 or more. At this asking price the tier is $1M to $1,999,999 at 1.00%, applied to the whole purchase price. It is due in cash at closing and cannot be financed.
Estimated mansion tax at asking
$16,500
Estimate based on the asking price. Confirm your own obligation with your real estate attorney.
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