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323 East 21st Street M4, New York NY 10010
323 East 21st Street M4, New York NY 10010
New York>Manhattan>Gramercy Park

323 East 21st Street M4New York, NY 10010

For Sale

$495,000

Smart Buyer Rebate - Ask

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.

Perhaps best of all, there is a remarkably liberal sublet policy, rarely seen in co-ops. After two years of ownership, unlimited subletting is allowed with co-op board approval.

Kindly note that the apartment is located on the third floor of a non-elevator building (three flights up). Pets will be considered on a case-by-case basis. Shown exclusively by appointment only. Disclaimer: Some photos have been virtually staged.

Listed by Amanda Rosenberg

·

The Heller Organization Inc

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(917) 923-3066

Last updated July 28, 2026

·

Source: REBNY #RLS20104045

RLS Data display by Prevu Real Estate LLC

Listing Facts

  • TypeCo-op
  • NeighborhoodGramercy Park
  • Bedrooms1
  • Bathrooms1
  • Days on Prevu16
  • HOA/Maint. Fees$1,838/month
  • Size550 sqft
  • Price per sqft$900

Amenities

  • Pets Allowed
  • Pied-A-Terre Allowed

Location

Mortgage Calculator

Listing History

07/16/2026
Listed by The Heller Organization Inc
$495,000

Estimated Closing Costs

Attorney Fees
$4,000
Bank Attorney
$1,500
Other Closing Costs
$4,000
Total
$9,500

Estimated closing costs are based on the list price of $495,000 and a 20% downpayment. These estimates are for indicative purposes only. Actual closing costs may vary for each transaction. See the Closing Costs Calculator for calculations specific to your situation.

Property Details for 323 East 21st Street M4

Association

Amenities

  • Pets Allowed: Building Yes, Yes

Fees

  • Association Fee: $1,838.00 Monthly

Financial

  • Flip Tax: 2.0%
  • Flip Tax Remarks: ASK EXCL BROKER

Exterior

Construction

  • Stories Total: 5
  • Year Built: 1910
  • Architectural Style: Prewar
  • Entry Level: 3

Financial

Taxes

  • Parcel Number: 0927-0015-00323-000-00000M4

Interior

Features

  • Fireplace Features: Decorative
  • Fireplace: Yes
  • Fireplaces Total: 1
  • Interior Features: Dining Area, Entrance Foyer, Kitchen Window

Measurements

  • Living Area: 550
  • Living Area Units: SquareFeet

Rooms

  • Bathrooms Full: 1
  • Bathrooms Total Integer: 1
  • Bedrooms Total: 1
  • Rooms Total: 3

Other

Location

  • City Region: Manhattan
  • Subdivision Name: Gramercy Park
  • Tax Block: 0927
  • Tax Lot: 0015

Utilities

Equipment

  • Cooling: Wall Unit(s)
  • Has Cooling: Yes
  • Other Equipment: Intercom

Frequently Asked Questions

How many bedrooms and bathrooms does this co-op have?

There is 1 bedroom and 1 bathroom in this co-op at 323 East 21st Street M4.

Are pets allowed at 323 East 21st Street?

Yes, 323 East 21st Street allows pets.

How does 323 East 21st Street M4 compare to other co-ops in Gramercy Park?

This co-op is listed 74% below the average price for co-ops in Gramercy Park and has been on the market for 129 less days than the typical home in this area.

What is the square footage on this co-op?

According to the MLS, this listing is 550 sqft.

323 East 21st Street M4 is a 1-bedroom, 1-bath co-op for sale in New York NY 10010. Available on Prevu for 16 days at $495,000. This property features 550 square feet of living space, located in Gramercy Park. The median listing price for co-ops in this area is $1,660,000. Additional amenities include pets allowed and pied-a-terre allowed. Browse more co-op listings in Manhattan.

RLS Data display by Prevu Real Estate LLC The Registrant acknowledges each other RLS Broker's ownership of, and the validity of their respective copyright in, the Exclusive Listings that are transmitted over the RLS. The information is being provided by RLS at REBNY Listing Service, Inc. Information deemed reliable but not guaranteed. Information is provided for consumers' personal, non-commercial use, and may not be used for any purpose other than the identification of potential properties for purchase. This information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity in the market. 2026 RLS at REBNY Listing Service, Inc. All rights reserved. Based on information from the Real Estate Board of New York and/or other sources. This information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity. 2026 The Real Estate Board of New York, Inc., All rights reserved.

Full MLS Disclaimers

Rebate estimate is indicative only and based on listing price and estimated buyer's agent commission paid by owner, if applicable. Final rebates are subject to Terms of Use and may vary due to final negotiated transaction terms.