323 E 21st Street #M4
MLS® #RLS20104045
Listing by The Heller Organization Inc
1
Bedroom
1
Bath
550
Sq. Ft.
1910
Year Built
Quick Summary
Property Highlights
- Exposure: South,West facing
- Fireplace: 1 fireplace
- Style: Prewar,WalkUp architecture
Property Details
Listing History
| Event | Date | Price | Change |
|---|---|---|---|
| Listed | Jul 16, 2026 | $495,000 | - |
| Currently | Jul 16, 2026 | $495,000 | - |
Description
Tucked away beyond a private courtyard is a rarely available one-bedroom home in a prewar co-op built in 1910 known as the Colonial Mews. A renovated windowed kitchen and en suite bathroom complement original details which preserve the apartment's charm, such as a decorative fireplace against exposed brick. With treetop views from both the living room and bedroom overlooking the courtyard to the South, and treetop views from the kitchen to the West, this corner apartment is uniquely private, as it is set back from the street. Additional features include two spacious closets, and thru-wall air-conditioning units in both the living room and bedroom. Kindly note that the apartment is located on the third floor of a non-elevator building (three flights up). Pets and subletting will be considered on a case-by-case basis. Shown exclusively by appointment only. Disclaimer: Some photos have been virtually staged.
Features & Amenities
Interior Features
Exterior Features
Building Information
Financial Details
About Gramercy Park
View All Gramercy Park ListingsGramercy Park is one of New York City’s most storied and architecturally distinctive neighborhoods, centered around the only private park in Manhattan. The area exudes old-world charm with its gas-lit streets and impeccably preserved 19th-century architecture. While the park itself is private, the surrounding real estate offers a mix of historic brownstones, elegant pre-war cooperatives, and boutique new developments that cater to those seeking a low-traffic urban retreat.
Gramercy Park Live Market Data
View NeighborhoodActive Listings
157
Median Asking Price
$1.40M
Median $/Sqft
$1,775
Avg Days on Market
N/A
New This Week
4
Price Reduced
32%
Sold (30 Days)
45
Median Sale Price
$1.38M
Live data from RLS at REBNY • Updated 7/16/26, 4:47 PM EST
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Location
323 E 21st Street #M4, Gramercy Park, New York County • Near Second Avenue/First Avenue
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 $1,838 per month. Confirm the exact amount with the listing broker before making an offer.
This property has 1 bedroom and 1 full bathroom.
The listed interior living area is 550 square feet. Verify dimensions independently during due diligence.
According to MLS records, the building was constructed in 1910, making it approximately 116 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.
At the current list price of $495,000 for 550 sq ft, the asking price per square foot is approximately $900. 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 The Heller Organization Inc - Amanda Rosenberg
Listing Contact: (917) 923-3066
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 7/16/2026 at 8:47 PM UTC