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403 West 21st Street
403 West 21st Street
Last updated on Aug 10, 2026

403 West 21st Street

Co-op located in Chelsea, between Ninth Avenue & Tenth Avenue

Intimate prewar Chelsea co-op with just ten spacious apartments featuring classic details and modern amenities on a quiet tree-lined block. Steps from the High Line, Chelsea Market, and world-class dining, with low maintenance and flexible ownership policies.

403 West 21st Street Location Map

All Apartments For Sale

Unit #
Beds
Baths
Size
Closing Price
Price / Ft2
Asking Price
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Overview of 403 West 21st Street

403 West 21st Street is a compact prewar co-op completed in 1900, with five stories, 10 apartments, and a turn of the century brownstone façade. The walk up building occupies the Seminary block, a tree lined stretch of West Chelsea between Ninth and Tenth Avenues, and retains classic period details in its public interiors.

Apartments are generally spacious, with high ceilings, oversized double hung windows, hardwood floors, and north and south exposures that bring open city, sky, and garden views. Open kitchens with stainless steel appliances and dishwashers recur among the layouts, while washer dryers are permitted. The co-op's flexible alteration policies also allow two adjacent top floor one bedroom apartments to be combined into a two or three bedroom home.

The building has a voice intercom and a pet friendly policy. Its co-op policies permit gifting, co-purchasing, pied-à-terres, and subletting. The location places the High Line, Chelsea Piers, Hudson River Park, Clement Clarke Moore Park, Chelsea Market, the Whitney Museum, Little Island, and the Meatpacking District within the surrounding West Chelsea and Hudson River neighborhood, along with more than 200 art galleries, restaurants, and shops.

Doorman
None
Type
Co-op
Year Built
1900
Apartments
Floors
5
Neighborhood
Min Down
20%
403 West 21st Street building photo 1
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  1. C
  2. E
at 8th Ave and 25th 0.24 miles
  1. A
  2. L
at 8th Ave and 16th 0.32 miles
  1. 1
at 7th Ave 0.37 miles

Sales History

Price/Room (Est)

Why are we displaying the estimated price per room?

For some co-ops, instead of price per square foot, we use an estimate of the number of rooms for each sold apartment to chart price changes over time. This is because many co-op listings do not include square footage information, and this makes it challenging to calculate accurate square-foot averages.

By displaying the price per estimated room count, we are able to provide a more reliable and consistent metric for comparing sales in the building. While we hope that this gives you a clearer sense of price trends in the building, all data should be independently verified. All data provided are only estimates and should not be used to make any purchase or sale decision.

Price/Ft2 (Est)
View Full Closing History

Sales Summary

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Pricing Comparison of Similar Buildings

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