Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
21 E 90TH Street #9C

For Sale · Listing by Corcoran Group

21 E 90TH Street #9C

Carnegie Hill, Manhattan

$2,590,000

Interested in this property?
Active For Sale Co-op

$2,590,000

$1,727 per sq ft

21 E 90TH Street #9C

Carnegie Hill, Manhattan

MLS® #RLS20110420

RLS at REBNY

Listing by Corcoran Group

Open House Scheduled

Sunday, September 20 • 12:00 PM – 1:00 PM

REBNY 2025: signed Buyer Representation Agreement required before any showing.

2
Bedrooms
2
Baths
1,500
Sq. Ft.
1927
Year Built

Quick Summary

Bedrooms 2
Bathrooms 2
Living Area 1,500 sq ft
Year Built 1927
Ownership Co-op
Maintenance $3,804/mo
Neighborhood Carnegie Hill
Floor 9 of 15

Property Highlights

  • Views: Other
  • Exposure: East,West facing
  • Fireplace: 1 fireplace

Property Details

Type Co-op
Ownership Stock Cooperative
Total Rooms 5
Baths 2 Full
Floor 9 of 15
View Other
Exposure East,West
Pets Yes
Year Built 1927
Living Area 1,500 sq ft
Structure Type HighRise
Basement Other
Block/Lot 01502/0017

Listing History

Event Date Price Change
Listed Sep 16, 2026 $2,590,000 -
Currently Sep 16, 2026 $2,590,000 -

Description

Welcome to 21 East 90th Street, Apartment 9C A rare opportunity to create your dream home in the heart of Carnegie Hill, this spacious five-room residence offers the trifecta of what makes a New York apartment special: views, wonderful bones, and an exceptional location. Set in a prestigious pre-war, full-service, white-glove cooperative, the apartment is entered from a gracious semi-private landing, shared by just two apartments, into a large proper foyer. From the moment you enter, the expansive outlook and abundant light is immediately apparent, with views of a magnificent neighboring building, rooftops, open sky, and, most spectacularly, from one of the bedrooms, views toward Central Park and the West Side across the Reservoir. Wait until you see those sunsets! The residence offers two oversized bedrooms, each with walk-in closets and en-suite windowed bathrooms, each equally easy to designate as the primary. The large windowed kitchen (housing the highly coveted in-unit washer and dryer), and adjacent breakfast room gives you plenty of space to be creative. The generously proportioned living room, centered on a decorative fireplace, provides an inviting setting for both everyday living and entertaining, while the formal dining room is large enough to comfortably accommodate many guests and celebrations. One of the co-op's most distinctive conveniences is its service entrance, an enduring hallmark of classic Upper East Side living. Deliveries, groceries, dry cleaning, mail, and garbage can all be handled discreetly through the service door. The building also offers a full time doorman, a friendly and helpful support staff, live-in superintendent, and a small workout room, providing the level of service and convenience that define white-glove living. Perfectly situated in the center of Carnegie Hill, 21 E. 90th St. welcomes pets and pied-à-terre living. There is a 2% flip tax and 50% financing is allowed. The coop benefits from stable commercial income keeping the monthlies lower than many other buildings in the neighborhood. There is FIOS available, and a dedicated storage bin transfers with the sale. While in need of updating and ready for your vision, its generous proportions, pre-war character, excellent layout, and extraordinary views provide the ideal foundation for creating a truly exceptional home. Just half a block from Central Park and Museum Mile, you are surrounded by the best of the Upper East Side: Madison Avenue's elegant boutiques and restaurants, recognizable names along with beloved mom-and-pop establishments, world class schools and museums, and convenient access to public transportation. With its remarkable views, gracious proportions, exceptional building services, and prime Carnegie Hill location, 9C is a good fit for customers seeking a particular style of living.

Features & Amenities

Interior Features

Separate Formal Dining Room High Ceilings Storage Building Other Washer Hookup In Unit Fireplace (1)

Exterior Features

None

Building Amenities

Elevators

Appliances

Washer Dryer Allowed

Building Information

Building Data View Compliance & Permits
Total Units 50
Stories 15
Structure HighRise

Financial Details

Maintenance $3,804/mo

Carnegie Hill is a low-traffic residential section of the Upper East Side defined by proximity to Central Park and Museum Mile. The area features low-rise historic architecture and large pre-war cooperatives, with landmarked blocks and boutique retail along Madison Avenue.

Carnegie Hill Live Market Data

View Neighborhood

Active Listings

95

Median Asking Price

$2.25M

Median $/Sqft

$1,711

Avg Days on Market

N/A

New This Week

16

Price Reduced

31%

Sold (30 Days)

15

Median Sale Price

$2.13M

Live data from RLS at REBNY • Updated 9/16/26, 7:58 PM EST

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Location

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21 E 90TH Street #9C, Carnegie Hill, New York County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

2013
Year Built
13 years old
4
Floors
4
Residential Units
R6B
Zoning District
Primarily Residential Mixed Use

Tax & Assessment

Assessed Value: $447,750
Land Value: $56,700
Exemptions: $0

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

Lot Area: 1,263 SF
Building Area: 4,670 SF
Built FAR: 3.7
Allowed FAR: 2

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 $3,804 per month. Confirm the exact amount with Milton Coste before making an offer.

This property has 2 bedrooms and 2 full bathrooms.

The listed interior living area is 1,500 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1927, making it approximately 99 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.

At the current list price of $2,590,000 for 1,500 sq ft, the asking price per square foot is approximately $1,727. 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 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) 416-7433
MLS® ID: RLS20110420
First Listed: 8/20/2026
On Market: 9/16/2026
Contract Date: 8/20/2026

Listing Courtesy of Corcoran Group - Linda Feder

Listing Contact: (917) 679-1739

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 9/16/2026 at 11:58 PM UTC

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Carnegie Hill Market Update

15 sales last 30 days · $2.25M median · 6.3 months supply

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Quick Facts

Status Active Type Co-op Neighborhood Carnegie Hill Borough Manhattan
County New York
Floor 9 of 15
Year Built 1927
First Listed 8/20/2026
Living Area 1,500 sqft
Maintenance $3,804/mo

Monthly Costs Estimate

Down Payment 20%

$518,000

Interest Rate Loading...

Source: Freddie Mac PMMS

Loan Term 30 years

Est. Monthly Payment

$0

Principal & Interest $0
PMI (under 20% down) $0
Maintenance $3,804
Total Monthly $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 $2M to $2,999,999 at 1.25%, applied to the whole purchase price. It is due in cash at closing and cannot be financed.

Estimated mansion tax at asking

$32,375

Run the numbers on a different offer price

Estimate based on the asking price. Confirm your own obligation with your real estate attorney.

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