Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
4 W 21st Street #12C
Interested in this property?
Active For Sale Condop

$1,175,000

$1,095 per sq ft

4 W 21st Street #12C

Flatiron, Manhattan

4W21

MLS® #RLS20070403

RLS at REBNY

Listing by Compass

Open House Scheduled

Thursday, May 7 • 12:00 PM – 1:00 PM

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

1

Bedroom

2

Baths

1,073

Sq. Ft.

2006

Year Built

Quick Summary

Bedrooms 1
Bathrooms 2
Living Area 1,073 sq ft
Year Built 2006
Ownership Condop
HOA/Common Charges $2,573/mo
Property Taxes $30,504/yr
Parking Garage
Neighborhood Flatiron
Floor 12 of 17

Property Highlights

  • Exposure: North facing
  • Outdoor Space: Deck
  • Parking: Private garage

Property Details

Type Condop
Ownership Condop
Total Rooms 4
Baths 2 Full
Floor 12 of 17
Exposure North
Pets Yes, CatsOk, DogsOk
Year Built 2006
Living Area 1,073 sq ft
Parking Garage Available
Parking Features Garage
Structure Type HighRise
Furnished Unfurnished
Parcel # 0822-0045-00004-000-000012C
Block/Lot 00822/0045

Listing History

Event Date Price Change
Listed Mar 24, 2026 $1,175,000 -
Price Reduced Apr 23, 2026 $1,250,000 +6.4%

Description

Introducing an exceptional opportunity to own a refined modern residence in the heart of the Flatiron District. Residence 12C at 4 West 21st Street offers 1,073 square feet of thoughtfully designed living space, perfectly balancing loft-like openness with contemporary comfort. Upon entry, the home immediately impresses with rich dark hardwood floors, central air conditioning, and walls of floor-to-ceiling windows that flood the residence with natural light throughout the day. The expansive layout allows for effortless entertaining while maintaining a sense of intimacy and flow. At the heart of the home is a chef’s kitchen, beautifully appointed with Sub-Zero refrigeration, a Miele gas range and dishwasher, a generously sized Kohler sink with garbage disposal, Poliform Varenna high-gloss lacquer cabinetry, and Pied Auberge stone countertops, creating a sleek and highly functional culinary space. The open-concept kitchen seamlessly connects to the dining and living areas, while the oversized primary bedroom is tucked away for privacy and features three spacious closets and a luxurious, windowed five-fixture en-suite bathroom with a Kohler soaking tub and separate glass-enclosed shower. A second full bathroom, ideal for guests, adds flexibility and convenience. An in-unit washer/dryer completes the home. Designed by Hugh Hardy with interiors by Anthony Todd, 4 West 21st Street is a full-service condop offering a 24-hour concierge, live-in superintendent, fitness center, landscaped outdoor spaces, and on-site parking garage. Perfectly situated just moments from Fifth Avenue, Madison Square Park, Eataly, Trader Joe’s, and major transportation including the 1, 6, N, R, F, and M trains, this residence delivers sophisticated city living in one of Manhattan’s most coveted neighborhoods. Monthly condop maintenance is $5,116, broken down as follows: Maintenance: $1,872 Taxes: $2,543 Ground lease: $701 There is an assessment in place in the amount of $804.48 per month ending on June 1,2027.

Features & Amenities

Interior Features

Building Washer Dryer Install Allowed Common On Floor Common Area

Exterior Features

Building Roof Deck Private Outdoor Space Under60 Sqft Deck

Building Amenities

Concierge Elevators Fitness Center Health Club

Building Information

Building 4W21
Building Data View Compliance & Permits
Total Units 56
Stories 17
Structure HighRise

Financial Details

Common Charges $2,573/mo
RE Taxes $30,504/yr ($2,542/mo)
Previous Price $1,250,000
Land Lease Yes

The Flatiron District is a busy intersection of history, technology, and luxury living. Named after the iconic Flatiron Building, the neighborhood is centered around Madison Square Park and is a hub for the city's 'Silicon Alley.' The real estate market is famous for its grand cast-iron loft buildings with high ceilings and expansive floor plans, alongside ultra-luxury glass towers that offer modern amenities and central Manhattan convenience.

Flatiron Live Market Data

View Neighborhood

Active Listings

131

Median Asking Price

$2.20M

Median $/Sqft

$1,755

Avg Days on Market

N/A

New This Week

11

Price Reduced

27%

Sold (30 Days)

10

Median Sale Price

$2.27M

Live data from RLS at REBNY • Updated 5/7/26, 4:48 AM EST

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Location

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4 W 21st Street #12C, Flatiron, New York County

Floor Plans

Floor Plan 1
Floor Plan 2

Building Information

Official NYC property records for this building

2005
Year Built
21 years old
17
Floors
54
Residential Units
C6-4A
Zoning District
Elevator Apartments Historic District: Ladies' Mile Historic District

Tax & Assessment

Assessed Value: $18,077,400
Land Value: $900,000
Exemptions: $2,290

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

Lot Area: 9,384 SF
Building Area: 119,136 SF
Built FAR: 12.7
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 $2,573 per month. Confirm the exact amount with the listing broker before making an offer.

The current listed annual property tax is $30,504, or roughly $2,542 per month. Verify the current assessment with your attorney before closing.

This property has 1 bedroom and 2 full bathrooms.

The listed interior living area is 1,073 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 2006, making it approximately 20 years old.

This listing is a condop, a hybrid structure where the building is legally a co-op but individual units are sold with greater flexibility, often including subletting rights similar to condos.

Pets are permitted at this property: 3. Contact the listing broker for weight limits or breed restrictions.

At the current list price of $1,175,000 for 1,073 sq ft, the asking price per square foot is approximately $1,095. 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) 416-7433
MLS® ID: RLS20070403
First Listed: 2/4/2026
On Market: 3/24/2026
Price Changed: 4/23/2026
Contract Date: 2/4/2026

Listing Courtesy of Compass - Justin D Rubinstein

Listing Contact: (646) 320-7745

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 5/7/2026 at 8:48 AM UTC

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