4 W 21ST Street #12B
MLS® #RLS10775169
Listing by Brown Harris Stevens Residential Sales LLC
3
Bedrooms
3
Baths
N/A
Sq. Ft.
2005
Year Built
Quick Summary
Property Highlights
- Parking: Private garage
Property Details
Listing History
| Event | Date | Price | Change |
|---|---|---|---|
| Listed | Feb 16, 2022 | $1,800,000 | - |
| Currently | May 18, 2026 | $1,725,000 | -4.2% |
Description
Designed by preeminent architect Hugh Hardy with interiors by Anthony Todd 4 West 21st offers residents an unparalleled lifestyle. This spacious mint condition two bedroom three bathroom home was expertly planned and customized to create a great deal of flexibility and effortlessly transforms into a three bedroom. An expansive wall of floor to ceiling glass windows illuminates the lofty "great room" that is designed for grand living/dining with a breakfast bar that is open to the custom chef's kitchen. The kitchen features fitted Poliform Verenna white cabinets, Subzero refrigerator and Miele appliances. Off the living/dining area is a generous space with the same floor to ceiling windows. Four floor to ceiling smoky glass panels slide seamlessly to create privacy for a third bedroom, guest room or office or they can be easily hidden away to add more entertaining space to this already North to South lofty apartment. Strategically located off the main hallway is a full bathroom that can be used as a powder room or as a dedicated bathroom for this additional flexible room. Separated from the entertaining space is the generous primary bedroom suite that features a sumptuous bathroom with full depth soaking tub, glass shower, and double vanity. An oversized dressing room size walk-in closet completes the space. The second bedroom has an en-suite bathroom as well.
This home boasts 10 foot ceilings, North to South exposures, floor to ceiling windows, exceptional closet space, dark stained oak floors, central air conditioning and has a washer/dryer.
This full service building located in the heart of the Flat Iron District is conveniently located near Madison Square Park, Union Square Park and such notable restaurants as Upland, Almond, Cosme, Rezdora, Sagaponack NYC Bar, and Eataly. 4 West 21st Street has 24 hour concierge service, a fully equipped gym and a landscaped garden and playroom. A garage resides next door under its own management. This condop acts just like a condo in all respects. Pet and investor friendly!
Features & Amenities
Interior Features
Appliances
Building Information
Financial Details
About Flatiron
View All Flatiron ListingsThe 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 NeighborhoodActive Listings
137
Median Asking Price
$2.42M
Median $/Sqft
$1,788
Avg Days on Market
N/A
New This Week
10
Price Reduced
32%
Sold (30 Days)
3
Median Sale Price
$1.40M
Live data from RLS at REBNY • Updated 5/18/26, 7:49 AM EST
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Location
4 W 21ST Street #12B, Flatiron, New York County • Near 5 AVENUE and AVENUE OF THE AMERICAS
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)
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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.
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Frequently Asked Questions
Common questions about this property
The current listed monthly maintenance are $6,541 per month. Confirm the exact amount with the listing broker before making an offer.
This property has 3 bedrooms and 3 full bathrooms.
According to MLS records, the building was constructed in 2005, making it approximately 21 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) 416-7433Listing Courtesy of Brown Harris Stevens Residential Sales LLC - Leslie Singer
Listing Contact: (212) 588-5675
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 5/18/2026 at 11:49 AM UTC