4 W 21st Street #12C
MLS® #RLS20070403
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
Property Highlights
- Exposure: North facing
- Outdoor Space: Deck
- Parking: Private garage
Property Details
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
Exterior Features
Building Amenities
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
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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4 W 21st Street #12C, Flatiron, New York County
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 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) 416-7433Listing 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 Data display by Keller Williams NYC. Data last updated on 5/7/2026 at 8:48 AM UTC