Skip to Content
Infinity Flats, 24 East 21st Street, NYC - Condo Apartments
Infinity Flats, 24 East 21st Street
Condo in Flatiron/Union Square
  • Apartments
  • Overview & Photos
  • Maps
  • Ratings & Insider Info
  • Floorplans
  • Sales Data & Comps
  • Similar Buildings
Get alerts with new listings in this building!
24 East 21st Street

Infinity Flats,
24 East 21st Street

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

$1,825 Avg. price/ft2 Apts. For Sale
  • Apartments For Sale (1)
  • All Units in Building (8)
Unit #
Beds
Baths
Size
Price / Ft2
Price
Listed on
Days on Market

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
8
Floors
9
Neighborhood
Min Down
20%
8Apartments
View All Past
Sales & Rentals
in Building

Schedule a Visit

Select when you would like to view apartments.
Mon
17
Tue
18
Wed
19
Thu
20
Fri
21
Sat
22
Sun
23
Mon
24
Tue
25
Wed
26

What Time?

9am-noon
Noon-3pm
3pm-6pm
Any time
You can also call us anytime at
☎️ (212) 755-5544

Amenities

  • Pre War
  • Elevator

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

Discover hidden opportunities at Infinity Flats! Reach out today to learn about select off-market listings.

{ "key" : "AIzaSyDquABdSLhathmwfnoTcYwA1BY6coZZyZk", "lat": 40.73937, "lng": -73.98903, "marker": { "icon": "https://img3.cityrealty.com/neo/i/w/amenities/base.png" } }

Nearby Subways

  1. 6
at Park Ave 0.13 miles
  1. N
  2. R
at Broadway 0.13 miles
  1. Q
  2. 4
  3. 5
  4. L
at Broadway and 16th 0.26 miles
  1. M
  2. F
at 6th Ave 0.31 miles
  1. 1
  2. 2
  3. 3
at 6th Ave and 16th 0.38 miles

Nearby Schools

  1. Ballet Tech Nyc Ps For Dance
    Grades: 4,5,6,7,8
  2. School Of The Future High School
    Grades: 6,7,8,9,10,11,12
  3. Baruch College Campus High School
    Grades: 9,10,11,12
  4. Manhattan Village Academy
    Grades: 9,10,11,12
  5. The Clinton School
    Grades: 6,7,8,9,10,11,12
Data courtesy of GreatSchools.org
  1. Ecole Internationale De New York - The Ecole
    Grades: PK,TK,KG,1,2,3,4,5,6,7,8
  2. Xavier High School
    Grades: 9,10,11,12
  3. John A Coleman School
    Grades: UG
  4. New York Hebrew
    Grades: PK,KG,1,2,3,4,5,6,7,8
  5. Epiphany Elementary School
    Grades: PK,KG,1,2,3,4,5,6,7,8
Data courtesy of GreatSchools.org

Carter’s Review

"This 9-story former commercial building between Broadway and Park Avenue South has been converted to 8 residential condominium apartments.

The pre-war building, which has a nice cornice, has a central atrium of glass, brushed aluminum and galvanized steel."
Read Full Review

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

18
/44
Architecture
+
24
/36
Location
+
16
/39
Features
+
9
Editor’s Points
=
67
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
Loading...

Infinity Flats, 24 East 21st Street Floorplans

Apt PH
4 beds, 4.5 baths, Approx. 4,109 ft2
Apt 3
3 beds, 4.5 baths, Approx. 4,109 ft2
Last sold for $4,300,000
on Jun 24, 2011
View Unit History
View All Floorplans
Created with Highstock 5.0.0SalesPrice Per Sq. Ft.200320042005200620072008200920102011201220132014201520162017201820192020202120222023202420250246810$900$1,000$1,100$1,200$1,300$1,400
Year
Avg Price / Ft2 (Est) Median Price / Ft2 (Est) Avg. Actual Price Med. Actual Price
Transactions
2025
-
-
-
-
0
2024
-
-
-
-
0
2023
-
-
-
-
0
2022
-
-
-
-
0
2021
-
-
-
-
0
2020
-
-
-
-
0
2019
-
-
-
-
0
2018
$1,241
$5,100,000
$1,241
$5,100,000
1
2017
-
-
-
-
0
2016
-
-
-
-
0
2015
-
-
-
-
0
2014
-
-
-
-
0
Year
Avg Price / Ft2 (Est) Median Price / Ft2 (Est) Avg. Actual Price Med. Actual Price
Transactions
2013
-
-
-
-
0
2012
-
-
-
-
0
2011
$1,046
$4,300,000
$1,046
$4,300,000
1
2010
$964
$3,951,667
$967
$3,975,000
3
2009
-
-
-
-
0
2008
-
-
-
-
0
2007
$1,241
$5,092,841
$1,245
$5,091,250
8
2006
-
-
-
-
0
2005
-
-
-
-
0
2004
-
-
-
-
0
2003
-
-
-
-
0

Sales History by Apartment Size

View Full Closing History
Show:
Created with Highstock 5.0.0Price/Ft²20082009201020112012201320142015201620172018$900$1,000$1,100$1,200$1,300$1,400

Pricing Comparison of Similar Buildings

View Detailed Comparison
Average Price per Sq. Ft.
$3,000
-
$2,700
-
$2,400
-
$2,100
-
$1,800
-
$1,500
-
$1,200
-
$900
-
$600
-
$300
-
$0
-
277 Fifth Avenue
The Ritz-Carlton Residences, New York, NoMad
10 Madison Square West
Madison Square Park Tower
12 East 13th Street
Flatiron House
200E20th
Huys
VU New York
The Prewar at Gramercy Square
The Greenwich
10 East 22nd Street
120 Gramercy Hill
88 & 90 Lex
Yves
15 Union Square West
 
|||
 
 

Similar Buildings

One Williamsburg Wharf
between South 11th Street & Division Avenue
Williamsburg
Radiant waterfront condos from $715K. Over 20,000 SF of resort-style amenities. 6sqft’s 2024 Building of the Year. 45% Sold | Summer 2025 closings.
Learn More

the following is a slider of images. For screen reader users, all slides are visible at all time so you may ignore control buttons.

 

Before you move on from this page

Sign-up and we'll email you new listings in this building!

or
Save Building with Email
By continuing you accept the Terms & Privacy Policy