Altair 20 at 15 West 20th Street: Apartments for Sale & Rent

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Last updated on Dec 21, 2025

Altair 20,
15 West 20th Street

Altair 20 is a boutique condominium in a Neo-Renaissance building with amenities including a fitness center and roof deck. Located in the Flatiron District, it offers convenient access to parks, shopping, and multiple subway lines.

Recent Sales (2) $1,333 Avg. price/ft²
All Units in Building (19)

Apt. 9A

2 beds

2 baths

2,259 ft²

$3,200,000 -7.2%

$1,417

$3,450,000

Nov 25, 2025

Apt. 3B

2 beds

3 baths

2,322 ft²

$2,900,000 -10.8%

$1,249

$3,250,000

Mar 22, 2022

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Overview of Altair 20 at 15 West 20th Street

Altair 20 is a boutique condominium in the bones of a Neo-Renaissance store-and-loft building in the Ladies Mile Historic District. A part-time doorman and live-in superintendent are on staff, and amenities include a La Palestra fitness center, storage, and a landscaped roof deck with cabanas and grills. Pets are welcome.

Altair 20 is located at 15 West 20th Street near Eataly, Trader Joe's, Madison Square Park, Union Square Park, and acclaimed restaurants like Eleven Madison Park. It is in the heart of the Flatiron District near NoMad, Chelsea, Union Square, and Gramercy. The N/R/W, F/M, 6, 1, and PATH trains are close by.

Doorman

None

Type

Condo

Year Built

1906

Converted: 2006

Apartments

19 (view all units)

Floors

Pets: Allowed

Neighborhood

Flatiron/Union Square (Manhattan)

Min Down

20%

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Amenities

Pre War
Central AC
Intercom
Rooftop Terrace
Elevator
Outdoor Entertainment Space
In-Unit Washer/Dryer
Fireplaces
Landmarked
Terraces / Balconies

Area Map StreetView

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at Broadway 0.15 miles

at 6th Ave 0.18 miles

at 6th Ave and 16th 0.26 miles

at Park Ave 0.29 miles

at Broadway and 16th 0.33 miles

at 8th Ave and 25th 0.50 miles

Pros & Cons

Sidewalk landscaping
Good location in Flatiron District
Storage
Live-in superintendent
Permits pets
Part-time doorman
Roof deck with cabanas and grill
Close to Subway

No balconies
No swimming pool
No concierge

CityRealty Rating

/44

Architecture

/36

Location

/39

Features

Editor’s Points

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
CityRealty’s Ratings Explained

Broker & Buyer Comments

Add Your Own Comment

This "boutique" prewar-turned-condo offers "exclusive privacy" with "just two residences per floor." The "tranquil" atmosphere begins in the "artfully designed" lobby, while the "spa-like" La Palestra fitness center and "harmoniously landscaped" roof deck with cabanas provide "resort-style" amenities. Located in the "hip" Flatiron district, it's "steps from" Madison Square Park and "world-class dining." The "prime" location off Fifth Avenue puts residents within "easy reach" of multiple subway lines and "coveted" shopping destinations like Eataly and Trader Joe's.

Sales History

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Editorial Coverage

Alternate Address

13 West 20th Street

The Treadwell

between Second Avenue & Third Avenue

Lenox Hill

Comfortable elegance on the Upper East Side. Whole-life amenities + complimentary 1-year memberships to Sollis Health and Omacasa | Immediate occupancy

4 beds starting at $9,500,000

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RLS IDX Data display by CityRealty.com, LLC. This information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity in the market. ©2026 The Real Estate Board of New York, Inc., All rights reserved. IDX information is provided exclusively for consumers’ personal, non-commercial use and it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

All information furnished regarding property for sale, rental or financing is from sources deemed reliable, but no warranty or representation is made as to the accuracy thereof and same is submitted subject to errors, omissions, change of price, rental or other conditions, prior sale, lease or financing or withdrawal without notice. All dimensions are approximate. For exact dimensions, you must hire your own architect or engineer and for no listing shall the number of bedrooms listed be considered a legal conclusion.

All closed sales data has been provided by the New York City Department of Finance via the Automated City Register Information System (ACRIS). No warranty or representation is made as to the accuracy of any data provided by ACRIS or any other sources.

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An equal housing opportunity

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Altair 20,15 West 20th Street

Overview of Altair 20 at 15 West 20th Street

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Altair 20,
15 West 20th Street

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