Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
4 W 21st Street #10B
Interested in this property?
Active For Sale Condop

$1,425,000

$859 per sq ft

4 W 21st Street #10B

Flatiron, Manhattan

4W21

MLS® #RLS20102442

RLS at REBNY

Listing by Compass

2

Bedrooms

3

Baths

1,658

Sq. Ft.

2006

Year Built

Quick Summary

Bedrooms 2
Bathrooms 3
Living Area 1,658 sq ft
Lot Size 9,384 sq ft
Year Built 2006
Ownership Condop
HOA/Common Charges $8,548/mo
Parking Garage
Neighborhood Flatiron
Floor 10 of 17

Property Highlights

  • Parking: Private garage

Property Details

Type Condop
Ownership Condop
Total Rooms 5
Baths 3 Full
Floor 10 of 17
Pets Yes, CatsOk, DogsOk
Year Built 2006
Living Area 1,658 sq ft
Parking Garage Available
Parking Features Garage
Structure Type MultiFamily
Furnished Unfurnished
Lot Size 9,384 sq ft
Parcel # 0822-0045-00004-000-000010B
Block/Lot 00822/0045

Listing History

Event Date Price Change
Listed Jul 8, 2026 $1,425,000 -
Currently Jul 8, 2026 $1,425,000 -

Description

This spectacular home boasts an AMAZING location and is perfect for those who love to entertain. An oversized loft-like living room and adjacent media room/third bedroom are lined with floor to ceiling windows bringing in lots of light. The stunning open chef’s kitchen easily becomes the heart of this home, and is perfect for entertaining. Features include Miele and Subzero appliances, sink disposal, under cabinet lighting and ample white on white custom enamel cabinetry and beautiful grey granite countertops and backsplash. The spacious master suite has the best walk-in closet one can hope for, doubling as a dressing room and featuring an extra linen/wardrobe closet. The master bath is accented with stunning white granite tiling throughout and is graced with an extra-large soaking tub, large glass enclosed shower, and double sinks. The second bedroom is generous in size with a large double closet and en-suite bath that along with the third bath, blends beautifully into the home with white and gray granite finishes. Other important features to this home include in-wall speakers in the kitchen, media room, master bedroom and master bath, oak floors throughout, washer/dryer and central air. 4 West 21st Street is a full service condop offering a newly refurbished on site gym, onsite parking, a second floor common terrace and 24 hour doorman. The building’s Flatiron location cannot be beat for a convenient and exciting downtown life; off of Fifth Avenue with Madison Square Park two short blocks away. Your lifestyle will truly blossom at 4 West 21st Street.

Features & Amenities

Interior Features

Building Washer Dryer Install Allowed Common On Floor Common Area

Building Amenities

Concierge Elevators Fitness Center

Building Information

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

Financial Details

Common Charges $8,548/mo
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

125

Median Asking Price

$2.40M

Median $/Sqft

$1,862

Avg Days on Market

N/A

New This Week

8

Price Reduced

36%

Sold (30 Days)

15

Median Sale Price

$2.10M

Live data from RLS at REBNY • Updated 7/8/26, 7:05 PM EST

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Location

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4 W 21st Street #10B, Flatiron, New York County

Floor Plans

Floor Plan 1

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 $8,548 per month. Confirm the exact amount with the listing broker before making an offer.

The current listed annual property tax is $0, or roughly $0 per month. Verify the current assessment with your attorney before closing.

This property has 2 bedrooms and 3 full bathrooms.

The listed interior living area is 1,658 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. Contact the listing broker for weight limits or breed restrictions.

At the current list price of $1,425,000 for 1,658 sq ft, the asking price per square foot is approximately $859. 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 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) 416-7433
MLS® ID: RLS20102442
First Listed: 7/8/2026
On Market: 7/8/2026
Price Changed: 7/8/2026
Contract Date: 7/10/2026

Listing Courtesy of Compass - Kemdi Uchenna Anosike

Listing Contact: (832) 655-2328

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 7/8/2026 at 11:05 PM UTC

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