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24 East 21st Street
Last updated on Mar 26, 2026

Infinity Flats,
24 East 21st Street

Infinity Flats is a 1935 building converted to a boutique condominium in 1982, featuring eight full-floor apartments with private elevators and virtual doorman service. Located in the Flatiron District, it offers convenient access to Madison Square Park, Eataly, fine dining, and Fifth Avenue shopping.

24 East 21st Street Location Map
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, is a boutique condominium conversion completed in 1982 from a 1935 commercial building. The nine-story beige brick structure features a two-story rusticated limestone base, limestone quoins, arched windows on the third floor, and a distinctive broken pediment entrance with carved detailing. Designed by Karl Fischer with interiors by Andrés Escobar & Associates, the building contains just eight full floor residences, each accessed by private key lock elevators. The building offers a virtual doorman, secure lobby lockers, and is pet friendly.

The full floor apartments range from approximately 4,073 to 4,109 square feet, with most units featuring three to four bedrooms and four to four and a half baths. Common features include white oak plank floors, beamed ceilings with dramatic skylights, gas fireplaces, and 40 foot plus living and dining rooms. Kitchens are outfitted with Sub-Zero, Viking, and Bosch appliances, Bilotta cabinetry, and marble or quartz countertops with walk in pantries. Master bathrooms showcase Calacatta Gold marble with deep soaking tubs and separate showers. The third floor unit stands out for its exceptionally high ceilings and custom renovation featuring Venetian plaster walls, hand painted master bedroom by artist Ivo Ivannov, red lacquered kitchen, and Murano chandeliers throughout.

The penthouse is particularly notable, offering over 4,100 square feet of interior space plus a 700 to 850 square foot private landscaped terrace with a three season cabana and views of the Met Life Tower and Empire State Building. The unit features 15 to 18 foot ceilings, skylights, a media room with full bar, and three zone central air conditioning. Former residents include David Wright, third baseman for the New York Mets. The building's Flatiron District location between Broadway and Park Avenue South provides convenient access to Madison Square Park, Union Square Park, and the neighborhood's acclaimed restaurants and shopping.

Doorman
None
Type
Condo
Year Built
1935
Converted: 1982
Apartments
Floors
9
Neighborhood
Min Down
20%

Amenities

  • Pre War
  • Resident Storage
  • Central AC
  • Elevator
  • In-Unit Washer/Dryer
  • Fireplaces
  • Terraces / Balconies
  • Virtual Doorman
{ "key" : "AIzaSyDquABdSLhathmwfnoTcYwA1BY6coZZyZk", "lat": 40.73937, "lng": -73.98903, "marker": { "icon": "https://img3.cityrealty.com/neo/i/w/amenities/base.png" } }

  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

Pros & Cons

  • Excellent location in Flatiron District
  • Private keyed elevators
  • Views of Met Life Tower and Empire State Building
  • Beamed ceilings
  • Calacatta Gold marble baths
  • Close to Subway
  • Central atrium of glass, brushed aluminum and galvanized steel
  • Fireplaces
  • Convenient to many restaurants and clubs
  • Sub-Zero, Viking, and Bosch appliances
  • Large- full-floor apartments
  • White oak plank floors
  • Good public transportation
  • Madison Square Park proximity
  • Union Square Park proximity
  • No sidewalk landscaping
  • No roof deck
  • No garage
  • Only 8 units in building
  • No traditional doorman

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 Summary

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Sales History by Apartment Size

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Pricing Comparison of Similar Buildings

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