Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433

SOLD FOR $4,000,000

· Closed March 8, 2022

850 PARK Avenue #4A
Closed For Sale Co-op

$4,000,000

850 PARK Avenue #4A

Upper East Side, Manhattan

MLS® #RLS10886574

RLS at REBNY

Listing by Sotheby's International Realty, Inc.

3

Bedrooms

3.5

Baths

N/A

Sq. Ft.

1913

Year Built

Quick Summary

Bedrooms 3
Bathrooms 4 full, 1 half
Lot Size 15,835 sq ft
Year Built 1913
Ownership Co-op
Maintenance $6,917/mo
Neighborhood Upper East Side
Floor 4 of 12

Property Highlights

  • Views: City
  • Fireplace: Wood-burning or decorative fireplace
  • Climate Control: Central Air

Property Details

Type Co-op
Ownership Stock Cooperative
Total Rooms 8
Baths 3 Full, 1 Half
Floor 4 of 12
View City
Cooling Central Air
Pets Yes
Year Built 1913
Lot Size 15,835 sq ft
Parcel # 1391-0040-00850-000-000004A

Listing History

Event Date Price Change
Listed Sep 28, 2021 $4,500,000 -
Currently May 14, 2026 $4,000,000 -11.1%

Description

Ideally situated on Park Avenue and 77th Street in one of the finest pre-war cooperatives, this fully renovated 9 into 8 room apartment offers sunny open exposure over Park Avenue, beautifully scaled rooms and a flexible layout. From a semi-private landing, one enters the spacious Gallery with access to each of the lovely entertaining rooms and separate bedroom wing. The gorgeous Park Avenue-facing Living Room is 23 feet long, has two oversized windows, and a wood burning fireplace. Across the gallery is gracious Formal Dining Room (now being used as a den), and comfortable Library (currently a Dining Room). The state-of-the-art windowed Kitchen features handsome marble countertops, a suite of top-of-the-line appliances, as well as a large Pantry Hall, Laundry area, Staff Room, and full Staff Bathroom. The private quarters wrap the south side of the building and include a sun drenched corner Master Bedroom Suite, with windows facing East over Park Avenue and another facing south, generous closets, and Marble Bathroom. There are two additional bright Bedrooms (one if which is also a corner with windows facing south and west), an additional marble Bathroom, and a Powder Room just off of the gallery. 850 Park Avenue is a full service pre-war cooperative building designed in 1914 by Rouse & Goldstone. Amenities include bike storage, fitness room, basketball court, courtyard and a play area. The building is pet friendly and allows 30% financing. There is a 2.5% flip tax payable by buyer.

Features & Amenities

Interior Features

Separate Formal Dining Room Entrance Foyer Eat In Kitchen Building Washer Dryer Install Allowed Common Area Fireplace

Appliances

Dryer Washer Dryer Allowed Washer

Building Information

Financial Details

Maintenance $6,917/mo
Original Price $4,500,000
Sale Price $4,000,000
Previous Price $4,500,000

The Upper East Side remains the gold standard for classic New York elegance. Known for 'Museum Mile' and its low-traffic, tree-lined streets, the neighborhood offers a refined lifestyle away from the midtown bustle. While famous for its historic cooperatives, the area has seen a recent surge in ultra-luxury new construction condos, particularly along the Second Avenue Subway corridor, making it a top choice for both traditionalists and modern buyers.

Upper East Side Live Market Data

View Neighborhood

Active Listings

341

Median Asking Price

$1.67M

Median $/Sqft

$1,498

Avg Days on Market

N/A

New This Week

20

Price Reduced

28%

Sold (30 Days)

41

Median Sale Price

$1.59M

Live data from RLS at REBNY • Updated 5/14/26, 2:34 AM EST

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Location

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850 PARK Avenue #4A, Upper East Side, New York County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

1914
Year Built
112 years old
12
Floors
51
Residential Units
R10
Zoning District
Elevator Apartments Historic District: Upper East Side Historic District

Tax & Assessment

Assessed Value: $21,431,700
Land Value: $4,905,000
Exemptions: $6,870

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

Lot Area: 15,835 SF
Building Area: 149,056 SF
Built FAR: 9.41
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 monthly maintenance are $6,917 per month. Confirm the exact amount with the listing broker before making an offer.

This property has 3 bedrooms and 3 full bathrooms and 1 half bathroom.

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 the listing broker for weight limits or breed restrictions.

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: RLS10886574
First Listed: 9/28/2021
Price Changed: 3/8/2022
Closed: 3/8/2022
Contract Date: 9/28/2021

Listing Courtesy of Sotheby's International Realty, Inc. - Serena Boardman

Listing Contact: (212) 606-7611

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 5/14/2026 at 6:34 AM UTC

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