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25 East 21st Street
Last updated on Mar 4, 2026

25 East 21st Street

Boutique Flatiron condominium with 11 full-floor lofts featuring soaring 12.5-13.5 foot ceilings and expansive 3,500-square-foot floor plates. Converted commercial building offers exceptional customization flexibility, including the rare opportunity to create a 7,000-square-foot duplex residence.

25 East 21st Street Location Map
Unit #
Beds
Baths
Size
Closing Price
Price / Ft2
Asking Price
Sold on
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Overview of 25 East 21st Street

25 East 21st Street is a boutique condominium building comprising 11 full floor units located on a quiet block in the heart of the Flatiron District. This intimate building was converted from commercial to residential use, providing buyers with as of right privileges to build out spaces for residential purposes. The building features a doorman and offers an exceptional opportunity for customization in one of Manhattan's most desirable neighborhoods.

Each floor spans an impressive 3,500 square feet with dimensions of over 40 feet wide and 82 feet deep. The lofts feature soaring ceiling heights ranging from 12.5 to 13.5 feet, creating dramatic open spaces with abundant natural light from south facing windows. The floor plates are remarkably open with only two small columns per floor, allowing for maximum flexibility in layout design. Individual floors can accommodate spacious 4 bedroom residences with 4 to 5 bathrooms, plus entertaining areas, media rooms, and ample storage.

A unique aspect of this building is the ability to combine the 2nd and 3rd floors to create a 7,000 square foot duplex, making it one of the largest Flatiron condo lofts available. This duplex configuration could accommodate up to 7 bedrooms with 7 to 8 bathrooms, along with extensive entertaining spaces, home offices, gym, spa, library, and staff rooms. The identical floor plates on each level provide seamless integration possibilities for this grand scale living arrangement.

The building's conversion from commercial to residential condo status grants owners significant flexibility in customizing their spaces. With existing floor plans available and architectural renderings to inspire design possibilities, buyers can work with architects to create truly personalized living environments. The combination of the building's intimate scale, prime Flatiron location, and exceptional customization potential makes these units particularly noteworthy in the Manhattan luxury market.

Doorman
Part Time
Type
Condo
Year Built
1904
Apartments
Floors
11
Neighborhood
Min Down
20%

Amenities

  • PT Doorman
  • Pre War
  • Central AC
  • Elevator
  • Landmarked
  • Library
  • Spa / Therapy Room
{ "key" : "AIzaSyDquABdSLhathmwfnoTcYwA1BY6coZZyZk", "lat": 40.7397631, "lng": -73.9887237, "marker": { "icon": "https://img3.cityrealty.com/neo/i/w/amenities/base.png" } }

  1. N
  2. R
at Broadway 0.11 miles
  1. 6
at Park Ave 0.11 miles
  1. Q
  2. 4
  3. 5
  4. L
at Broadway and 16th 0.29 miles
  1. M
  2. F
at 6th Ave 0.30 miles
  1. 1
  2. 2
  3. 3
at 6th Ave and 16th 0.41 miles

Pros & Cons

  • Prime Flatiron District location on quiet block
  • Boutique building with only 11 full floor units
  • Doorman service
  • Expansive 3,500 sq ft full floor units
  • Soaring 12.5 to 13.5 foot ceilings
  • Abundant natural light from south facing windows
  • Open floor plates with only 2 small columns
  • As of right privileges for residential buildout
  • Ability to combine floors creating 7,000 sq ft duplex
  • Central AC
  • Elevator access
  • Pre War building character
  • Landmarked building
  • Potential for library space
  • Potential for spa therapy room
  • Raw loft space requiring full buildout
  • Part time doorman only

Sales Summary

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Pricing Comparison of Similar Buildings

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Alternate Addresses

  • 23 East 21st Street
  • 23-25 East 21st Street
  • 25A East 21st Street
  • 25B East 21st Street
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