24 East 21st Street #PH

$6,750,000

For Sale

Delisted 2/3/2012

4,100 ft²

$1,646 per ft²

8 rooms

3 beds

4.5 baths

Condo
Flatiron

Seller's agents

Pro

Kirk Rundhaug

CORE

Ryan Fitzpatrick

CORE

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Report listing

Listing by CORE, Limited Liability Broker | Brokerage Listing ID: 365487

Common charges

$2,400/mo

Estimated payment

$43,278/mo

Taxes

$6,122/mo

Tax abatement

No info

About

Seller’s agent

Kirk Rundhaug

Unknown

CORE

Ryan Fitzpatrick

Unknown

CORE

description

Rare opportunity to purchase the penthouse at Infinity Flats, the premier loft condominium in the Flatiron District. With more than 4,000-square feet plus a spectacular private roof deck, this full floor loft offers dramatic and expansive living space, exquisite finishes and total privacy. The great room is defined by a salt-water aquarium and a gas fireplace with glass and stone.

Policies

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Home features

Fireplace
Loft

Building amenities

Services and facilities

Doorman
Virtual
Elevator
Storage space

Wellness and recreation

Hot tub

Shared outdoor space

Deck
Roof deck

About the building

Infinity Flats

24 East 21st Street, New York, NY 10010

Condo building inFlatiron

8 units

9 stories

1935 built

For sale

0 available units for sale

For rent

0 available units for rent

Documents and permits

View documents and permits

Learn more about Infinity Flats

Property history

Price Change: ↓ $200,000 (-2.9%) on 10/18/11
Days on market: 289 days

Date	Price	Event
12/21/2025	$6,995,000	Delisted by Brown Harris Stevens
9/22/2025	$6,995,000	Listed by Brown Harris Stevens
6/20/2025	$7,500,000	Delisted by Brown Harris Stevens
2/24/2025	$7,500,000	Price decreased by 3%
9/14/2024	$7,750,000	Listed by Brown Harris Stevens

Explore Flatiron

Transit

Location	Distance
RWat 23rd St	under 500 feet
6at 23rd St	under 500 feet
LNQRW456at 14th St–Union Square	0.21 miles
FMat 23rd St	0.29 miles
PATHat 23rd Street Station	0.31 miles

View transit on Google Maps

View on Google Maps

About Flatiron

Rental prices shown are base rent before any fees. Visit listings for cost and fees breakdown.

SalesMedian asking price

3 beds

$3.83M

RentalsMedian asking base rent

3 beds

$12,997

Flatiron is a historic New York City neighborhood that has seen its fair share of change over the years. In the early 1900s, it was a major commercial and residential center. By the middle of the century, things stagnated as businesses and residents left in search of more space and lower rents. In recent years, stores, upscale restaurants, and new developments moved back in, and the neighborhood is seeing a significant resurgence. Fifth Avenue now bustles with some of the best shopping in the city, and restaurants run the gamut from Michelin-rated to Yelp-reviewed food trucks.

Flatiron is busiest at midday and cocktail hour and tends to quiet down a bit at night, although the lights never truly turn off. Proximity to Union Square and multiple subway lines make it an equally easy trip to Midtown or Downtown.

Learn more about Flatiron