Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
521 Park Avenue #10C
Interested in this property?
Active For Sale Condo

$2,750,000

$1,634 per sq ft

521 Park Avenue #10C

Lenox Hill, Manhattan

MLS® #RLS20090259

RLS at REBNY

Listing by Sothebys International Realty

2

Bedrooms

2

Baths

1,683

Sq. Ft.

1911

Year Built

Quick Summary

Bedrooms 2
Bathrooms 2
Living Area 1,683 sq ft
Lot Size 6,025 sq ft
Year Built 1911
Ownership Condo
HOA/Common Charges $4,639/mo
Property Taxes $37,020/yr
Neighborhood Lenox Hill
Floor 10 of 12

Property Highlights

  • Views: City, Park Greenbelt
  • Exposure: South,West facing
  • Outdoor Space: Balcony

Property Details

Type Condo
Ownership Condominium
Total Rooms 6
Baths 2 Full
Floor 10 of 12
View City, Park Greenbelt
Exposure South,West
Pets Yes
Year Built 1911
Living Area 1,683 sq ft
Architectural Style Prewar
Structure Type HighRise
Flooring Hardwood
Furnished Unfurnished
Lot Size 6,025 sq ft
Block/Lot 01395/1126

Listing History

Event Date Price Change
Listed May 11, 2026 $2,750,000 -
Currently May 11, 2026 $2,750,000 -

Description

Experience classic Park Avenue living in this elegant corner two-bedroom, two-bath residence, offering approximately 1,683+/- square feet within one of Park Avenue’s most distinguished pre-war condominiums. Flooded with natural light from oversized windows on three exposures, the home enjoys sweeping views along Park Avenue and to Central Park. It is defined by soaring 10.5-foot ceilings that enhance the sense of space throughout. The living room is particularly well-proportioned—nearly square in layout—making it exceptionally easy to furnish and flexible for a variety of seating and entertaining arrangements. A decorative fireplace, set along a short dividing wall between the living and dining rooms, creates a natural separation while maintaining an easy, comfortable flow between the spaces. A formal dining room or used as a separate den provide excellent versatility, whether for entertaining, working from home, or quiet relaxation. The windowed kitchen is thoughtfully designed with granite countertops, abundant cabinetry, and premium appliances including Sub-Zero and Miele. The primary suite is bright and tranquil, featuring oversized south-facing windows, two generous walk-in closets, and a marble en-suite bath with double vanity and glass-enclosed shower. The second bedroom is equally well-sized, with its own walk-in closet and easy access to a full bath. A gracious gallery connects the public and private spaces, adding to the home’s sense of scale and arrival. Residents of 521 Park Avenue enjoy full-service living with a 24-hour doorman, live-in resident manager, fitness center, and private storage. The building is pet-friendly, permits pied-à-terres, and offers flexible financing. Designed by William Alciphron Boring and completed in 1911, 521 Park Avenue is a notable example of early cooperative living on Park Avenue. Boring, who trained at the École des Beaux-Arts and co-designed Ellis Island Immigration Station, brought a refined architectural sensibility to the building. Originally composed of full-floor residences, the building now contains a boutique collection of just 27 homes. This is a rare opportunity to own a spacious, light-filled residence that combines pre-war character, practical layout, and the enduring appeal of Park Avenue.

Features & Amenities

Interior Features

Entrance Foyer Eat In Kitchen Elevator Kitchen Window Storage Common On Floor In Unit Flooring: Hardwood

Exterior Features

Balcony Building Balcony Private Outdoor Space Over60 Sqft Balcony

Building Amenities

Elevators

Appliances

Dryer Washer Dryer Stacked Dishwasher Washer

Building Information

Building Data View Compliance & Permits
Total Units 24
Stories 12
Structure HighRise
Style Prewar

Financial Details

Common Charges $4,639/mo
RE Taxes $37,020/yr ($3,085/mo)

Lenox 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 Neighborhood

Active Listings

627

Median Asking Price

$1.27M

Median $/Sqft

$1,320

Avg Days on Market

N/A

New This Week

30

Price Reduced

33%

Sold (30 Days)

62

Median Sale Price

$1.35M

Live data from RLS at REBNY • Updated 5/11/26, 2:36 PM EST

Similar Listings in Lenox Hill

View All

Location

Loading map...

521 Park Avenue #10C, Lenox Hill, New York County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

1912
Year Built
114 years old
12
Floors
24
Residential Units
R10
Zoning District
Condominiums

Tax & Assessment

Assessed Value: $11,720,706
Land Value: $2,011,505
Exemptions: $1,276,062

Note: Individual unit taxes may differ. Verify current tax bills with NYC DOF.

Lot Area: 6,025 SF
Building Area: 49,749 SF
Built FAR: 8.26
Allowed FAR: 10

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

Frequently Asked Questions

Common questions about this property

The current listed common charges are $4,639 per month. Confirm the exact amount with the listing broker before making an offer.

The current listed annual property tax is $37,020, or roughly $3,085 per month. Verify the current assessment with your attorney before closing.

This property has 2 bedrooms and 2 full bathrooms.

The listed interior living area is 1,683 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1911, making it approximately 115 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 the listing broker for weight limits or breed restrictions.

At the current list price of $2,750,000 for 1,683 sq ft, the asking price per square foot is approximately $1,634. 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 mcoste@kwnyc.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) 416-7433
MLS® ID: RLS20090259
First Listed: 5/11/2026
On Market: 5/11/2026
Price Changed: 5/11/2026
Contract Date: 4/28/2026

Listing Courtesy of Sothebys International Realty - Glenn J Norrgard

Listing Contact: (917) 822-6840

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 at REBNY

RLS Data display by Keller Williams NYC. Data last updated on 5/11/2026 at 6:36 PM UTC

Buying a Condo? Start Here

Co-op vs. Condo: Which Is Right for You?

Ownership structure, board approval, financing: the full comparison.

Read article

Condo Due Diligence Checklist

What to review before signing: financials, reserve fund, offering plan.

Read article

How to Read a Condo Offering Plan

Decode the offering plan before you commit to any new development.

Read article

NYC Mansion Tax: 2026 Guide

How the tiered mansion tax works for purchases over $1M.

Read article

Interested in this property?

Your info is secure and never shared.

Call Text Email