4 West 21st Street, NYC - Condo Apartments

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4 West 21st Street

Doorman Condop located in Flatiron/Union Square, between Fifth Avenue & Sixth Avenue Map

$913 Avg. price/ft² Apts. For Sale

$889 Avg. price/ft² Recent Sales
(past 12 months)

Apartments For Sale (1)
Recent Sales (12)
All Units in Building (56)

Include In-Contract Listings (1)

Apt. 2B
(13 Photos)

2 beds

3 baths

1,466 ft²

$921

$1,350,000

Mar 5, 2025

20 days

#2B: $1,350,000 - 2 beds

in contract

#14D: $1,375,000 - 2 beds

#2B: $1,350,000 - 2 beds

Apt. 4D

2 beds

2.5 baths

1,495 ft²

$1,300,000

$870

$1,395,000

Jul 15, 2024

Apt. 11B

3 beds

3 baths

1,658 ft²

$1,450,000

$875

$1,550,000

Jun 28, 2024

Apt. 4B

2 beds

3 baths

1,500 ft²

$1,169,561

$780

Jun 27, 2024

Apt. 7C

2 beds

2 baths

1,256 ft²

$1,295,000

$1,031

$1,295,000

May 30, 2024

Apt. 12B

3 beds

3 baths

$1,725,000 -4%

$1,800,000

May 18, 2022

Apt. 10C

1 bed

2 baths

1,073 ft²

$1,165,000 -11%

$1,086

$1,350,000

Dec 13, 2021

Apt. 11C

1 bed

2 baths

1,100 ft²

$1,240,000 -4%

$1,127

$1,295,000

Nov 16, 2021

Apt. 12A

2 beds

2 baths

1,225 ft²

$1,240,000 -4%

$1,012

$1,295,000

Oct 14, 2021

Apt. 7D

2 beds

2.5 baths

1,518 ft²

$1,425,000 -20%

$939

$1,795,000

Oct 8, 2021

Apt. 2D

2 beds

2.5 baths

1,620 ft²

$1,500,000 -31%

$926

$2,200,000

Aug 30, 2021

Apt. 14B

3 beds

3 baths

1,674 ft²

$1,595,000 -13%

$953

$1,850,000

Jun 24, 2021

Apt. 3D

2 beds

2.5 baths

1,518 ft²

$1,200,000 -7%

$791

$1,400,000

Jun 14, 2021

View Full Sales History

Overview of 4 West 21st Street

4 West 21st Street is a full-service condop with a roof deck, residents' gym, bike room, and on-site parking. It is located just off Fifth Avenue in the heart of the Flatiron District with easy access to Union Square, Gramercy, Chelsea, and Midtown. Investors, co-purchasing, pets, and pied-a-terres are all permitted.

Year Built

2006

Apartments

Floors

Pets: Allowed

Neighborhood

Flatiron/Union Square (Manhattan)

Min Down

20%

56Apartments

View All Past
Sales & Rentals
in Building

Amenities

Attended Lobby
FT Doorman
High-Rise
Post War
Central AC
Health Club
Elevator
Fitness Center
Rooftop Terrace

Shh... Many units sell without being publicly listed.

Explore off-market possibilities at 4 West 21st Street – inquire to find out about residences with owners open to private offers!

Area Map StreetView

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Nearby Subways

at Broadway 0.12 miles

at 6th Ave 0.18 miles

at Park Ave 0.25 miles

at 6th Ave and 16th 0.29 miles

at Broadway and 16th 0.33 miles

Carter’s Review

"The quite handsome 17-story, mid-block, new residential building at 4 West 21st Street was completed in 2006. It is a condop, which means it is a co-operative building that has condominium-like rules.

The building is distinguished by its interesting and unusual façade of flush and indented windows that make alternating two-story-high window rectangles. This fenestration pattern overlaps a three-story-high façade grid creating a rich rhythm and visual modulation."
Read Full Review

Who's Carter?

Pros & Cons

Very handsome building
Close to Subway
Landscaped garden
Very good public transportation
Garage
Concierge
Excellent Flatiron/Chelsea location

No sidewalk landscaping
No balconies
No roof deck

CityRealty Rating

/44

Architecture

/36

Location

/39

Features

Editor’s Points

CITYREALTY
RATING

How is the CityRealty Rating calculated?
Architecture

30+ remarkable

20-29 distinguished

11-19 average

< 11 below average
Location

27+ remarkable

18-26 distinguished

9-17 average

< 9 below average
Features

22+ remarkable

16-21 distinguished

9-15 average

< 9 below average
CityRealty’s Ratings Explained

Broker & Buyer Comments

Add Your Own Comment

This "sophisticated" Flatiron condop offers "prime Fifth Avenue positioning" with a "coveted location" between Chelsea and Flatiron. The "new construction" boasts "dramatic floor-to-ceiling windows" with "stunning skyline views," while "luxury amenities" include a "fully equipped gym," 24-hour concierge, garage and "landscaped terrace." "Exceptional convenience" to multiple subway lines and "world-class shopping" make this an "ideal urban sanctuary."

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Pricing Comparison of Similar Buildings

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Editorial Coverage

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at the southeast corner of Third Avenue

Lenox Hill

A remarkable blend of classicism and contemporary sensibility. Spacious two- to six-bedroom homes on the Upper East Side. Delivery summer 2025

3 beds starting at $5,300,000
4 beds starting at $5,975,000
5 beds starting at $17,500,000

Learn More

RLS IDX Data display by CityRealty.com, LLC. This information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity in the market. ©2025 The Real Estate Board of New York, Inc., All rights reserved. IDX information is provided exclusively for consumers’ personal, non-commercial use and it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

All information furnished regarding property for sale, rental or financing is from sources deemed reliable, but no warranty or representation is made as to the accuracy thereof and same is submitted subject to errors, omissions, change of price, rental or other conditions, prior sale, lease or financing or withdrawal without notice. All dimensions are approximate. For exact dimensions, you must hire your own architect or engineer and for no listing shall the number of bedrooms listed be considered a legal conclusion.

All closed sales data has been provided by the New York City Department of Finance via the Automated City Register Information System (ACRIS). No warranty or representation is made as to the accuracy of any data provided by ACRIS or any other sources.

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An equal housing opportunity

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4 West 21st Street

Doorman Condop located in Flatiron/Union Square, between Fifth Avenue & Sixth Avenue Map

Overview of 4 West 21st Street

Amenities

Shh... Many units sell without being publicly listed.

Maps & 3D Aerial Views

Nearby Subways

Carter’s Review

Pros & Cons

CityRealty Rating

How is the CityRealty Rating calculated?

Broker & Buyer Comments

Sales History

Sales Summary

Sales History by Apartment Size

Pricing Comparison of Similar Buildings

Editorial Coverage

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