For Sale · Listing by Coldwell Banker Warburg
635 PARK Avenue #MAISONETTE
Lenox Hill, Manhattan
$1,650,000
635 PARK Avenue #MAISONETTE
MLS® #RLS20091282
Listing by Coldwell Banker Warburg
- 2
- Bedrooms
- 3
- Baths
- N/A
- Sq. Ft.
- 1913
- Year Built
Quick Summary
Property Highlights
- Views: Other
- Exposure: East,West facing
- Fireplace: 1 fireplace
Property Details
Listing History
| Event | Date | Price | Change |
|---|---|---|---|
| Listed | May 14, 2026 | $1,995,000 | - |
| Price Reduced | Sep 11, 2026 | $1,850,000 | -7.3% |
| Currently | Oct 27, 2026 | $1,650,000 | -10.8% |
Description
635 Park Avenue offers a rare level of privacy and pedigree in the heart of the Upper East Side. Designed by legendary architect J. E. R. Carpenter, this intimate white-glove cooperative contains just thirteen grand residences and a single maisonette - a uniquely elegant and generously sized 2-bedroom home with 3 large bathrooms, moments from Central Park. Positioned on the corner of East 66th Street and Park Avenue, this sophisticated maisonette combines classic prewar architecture with thoughtful modern upgrades. High ceilings, original moldings, herringbone floors, and beautifully scaled rooms create a sense of understated grandeur throughout. The expansive living room enjoys natural light from Park Avenue and offers an exceptional setting for entertaining or quiet daily living. The kitchen has recently been updated with premium appliances, including a Bosch refrigerator, dishwasher, and oven, along with an in-unit Miele washer and dryer - seamlessly integrates contemporary convenience into the home's timeless character. Privately situated away from the entertaining spaces, the two bedrooms offer exceptional tranquility and generous proportions. A separate space can easily act as a home office or open dining room. Abundant closets and deeded private storage further enhance the home's livability. Residents of 635 Park Avenue enjoy an exceptionally discreet and attentive level of service, including a full-time doorman, porter, resident superintendent, fitness room, and private storage. Just moments from Madison Avenue boutiques, world-class dining, the museums, the Park Avenue Armory, and Central Park, this is Upper East Side living at its most refined.
Features & Amenities
Interior Features
Exterior Features
Appliances
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
672
Median Asking Price
$1.26M
Median $/Sqft
$1,497
Avg Days on Market
N/A
New This Week
11
Price Reduced
32%
Sold (30 Days)
64
Median Sale Price
$1.35M
Live data from RLS at REBNY • Updated 10/27/26, 4:27 PM EST
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Location
635 PARK Avenue #MAISONETTE, Lenox Hill, New York County
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 monthly maintenance are $6,637 per month. Confirm the exact amount with Milton Coste before making an offer.
This property has 2 bedrooms and 3 full bathrooms.
According to MLS records, the building was constructed in 1913, making it approximately 113 years old.
This listing is a co-op (stock cooperative). Buyers purchase shares in a corporation rather than real property, and the board must approve all sales.
Pets are permitted at this property. Contact Milton Coste for weight limits or breed restrictions.
To schedule a private showing, contact Milton Coste at (917) 416-7433 or milton@miltoncoste.com. 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 Coldwell Banker Warburg - June L Gottlieb
Listing Contact: (917) 826-9996
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.
How working with a buyer's agent works: I work for you, not the seller. Before I show you anything, New York brokerage rules ask us to put that in writing: an agreement and a disclosure that say I work for you and negotiate on your behalf. The agreement is non-exclusive: you can work with other agents, it runs for a short fixed term we agree on, and you can end it with a note. You may attend open houses independently without an agreement. Read how it works
RLS Data display by Keller Williams NYC. Data last updated on 10/27/2026 at 8:27 PM UTC
See it in person
Sale history, taxes, violations and comps for this unit
Before you bid
Pre-Offer Report: 635 PARK Avenue #MAISONETTE
At $1,650,000, the listing leaves out what decides the offer: the recorded sale history, the tax and abatement picture, open building violations and permits, and the closed sales that set the price. Milton prepares the report from public records. No obligation.
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What happens next
- 1Milton emails you today.
- 2A short call about what you want and when.
- 3The agreement arrives electronically after the call. Then showings.
Your info is secure and never shared.
You're contacting Milton Coste, a buyer's agent. Before any private showing, New York brokerage rules require a short non-exclusive agreement. Milton walks you through it before you sign anything. Broker commissions are not set by law and are fully negotiable. How working together works.
Lenox Hill Market Update
64 sales last 30 days · $1.26M median · 10.5 months supply
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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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