Skip to Content
Infinity Flats, 24 East 21st Street, NYC - Condo Apartments
  • Apartments
  • Overview & Photos
  • Maps
  • Ratings & Insider Info
  • Floorplans
  • Sales Data & Comps
  • Similar Buildings
24 East 21st Street

Infinity Flats,
24 East 21st Street

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

$1,886 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

Amenities

  • Pre War
  • Elevator

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

Learn more about off-market listings at Infinity Flats!

{ "key" : "AIzaSyDquABdSLhathmwfnoTcYwA1BY6coZZyZk", "lat": 40.7393637, "lng": -73.9890289, "marker": { "icon": "https://img4-ab.cityrealty.com/neo/i/w/amenities/base.png" } }

Nearby Subways

  1. 6
at Park Ave 0.13 miles
  1. N
  2. R
at Broadway 0.14 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

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

Sales History by Apartment Size

View Full Closing History
Show:

Pricing Comparison of Similar Buildings

View Detailed Comparison
200 East 75th Street
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
Learn More