Infinity Flats, 24 East 21st Street, NYC - Condo Apartments

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Infinity Flats,
24 East 21st Street

condo located in Flatiron/Union Square, between Broadway & Park Avenue South

Apartments For Sale (1) $1,702 Avg. price/ft²
All Units in Building (8)

Apt. PH
(21 Photos)

4 beds

4.5 baths

4,109 ft²

$1,702

$6,995,000

Sep 22, 2025

74 days

#PH: $6,995,000 - 4 beds

Overview of Infinity Flats at 24 East 21st Street

Infinity Flats, located at 24 East 21st Street, was completed in 1935 and converted to a boutique condominium in 1982. The building comprises eight full-floor apartments, and features include private key-lock elevators, virtual doorman service, and secure lobby lockers. It is located in the heart of the Flatiron District near Madison Square Park, Eataly, fine dining, and Fifth Avenue shopping.

Year Built

1935

Converted: 1982

Apartments

Floors

Neighborhood

Flatiron/Union Square (Manhattan)

Min Down

20%

8Apartments

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Sales & Rentals
in Building

Amenities

Pre War
Elevator

Area Map StreetView

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Nearby Subways

at Park Ave 0.13 miles

at Broadway 0.13 miles

at Broadway and 16th 0.26 miles

at 6th Ave 0.31 miles

at 6th Ave and 16th 0.38 miles

Pros & Cons

Fireplaces
Convenient to many restaurants and clubs
Good public transportation
Excellent location in Flatiron District
Calacatta Gold marble baths
Sub-Zero refrigerators
White oak plank floors
Beamed ceilings
Central atrium of brushed aluminum and galvanized steel
Large- full-floor apartments
Close to Subway

No garage
No roof deck
No sidewalk landscaping

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

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Noteworthy Residents

Notable past and present residents at Infinity Flats

Editorial Coverage

Alternate Address

26 East 21st Street

720 West End Avenue

between West 96th Street & West 95th Street

Riverside Dr./West End Ave.

Upper West Side condos from $995K near Riverside Park and the Hudson River. Occupancy 2025 | 30,000 SF of indoor/outdoor amenities.

1 beds starting at $1,300,000
2 beds starting at $2,550,000
3 beds starting at $3,000,000
4 beds starting at $5,600,000
5 beds starting at $10,275,000

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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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Infinity Flats,24 East 21st Street

condo located in Flatiron/Union Square, between Broadway & Park Avenue South

Overview of Infinity Flats at 24 East 21st Street

Amenities

Maps & 3D Aerial Views

Nearby Subways

Pros & Cons

CityRealty Rating

How is the CityRealty Rating calculated?

Sales History

Sales Summary

Sales History by Apartment Size

Pricing Comparison of Similar Buildings

Noteworthy Residents

Editorial Coverage

Alternate Address

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Infinity Flats,
24 East 21st Street

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