Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
24 E 21ST Street #2
Interested in this property?
Active For Sale Condo

$5,650,000

$1,387 per sq ft

24 E 21ST Street #2

Flatiron, Manhattan

Infinity Flats

MLS® #RLS20095004

RLS at REBNY

Listing by Corcoran Group

3

Bedrooms

4.5

Baths

4,073

Sq. Ft.

1935

Year Built

Quick Summary

Bedrooms 3
Bathrooms 5 full, 1 half
Living Area 4,073 sq ft
Year Built 1935
Ownership Condo
HOA/Common Charges $3,107/mo
Property Taxes Contact for details
Neighborhood Flatiron
Floor 2 of 9

Property Highlights

  • Views: Other
  • Climate Control: Other
  • Character: Pre-war building (1935)

Property Details

Type Condo
Ownership Condominium
Total Rooms 8
Baths 4 Full, 1 Half
Floor 2 of 9
View Other
Cooling Other
Pets Yes
Year Built 1935
Living Area 4,073 sq ft
Structure Type HighRise
Basement Other
Parcel # 0849-1502
Block/Lot 00849/1502

Listing History

Event Date Price Change
Listed Jun 2, 2026 $5,650,000 -
Currently Jun 2, 2026 $5,650,000 -

Description

24 East 21st Street is a rare opportunity to own a full-floor residence in one of Flatiron's most discreet boutique condominiums.

A private elevator opens directly into the grand living and dining room, an impressive 40 by 20 feet with soaring 11-foot beamed ceilings, stained wide-plank oak floors, and natural light from both north and south exposures. A glass, brushed aluminum, and galvanized steel-enclosed gas fireplace anchors the space, while elegant glass doors open onto a private central outdoor atrium with a stunning pergola - a serene focal point at the heart of the home. Enormous picture windows frame the streetscape throughout.

The chef's kitchen is appointed with a seamless Bianco Statuario marble island and breakfast bar, custom Italian white lacquer and aluminum cabinetry, a walk-in pantry, and a premium appliance suite including a 27-inch Sub-Zero refrigerator, 27-inch Sub-Zero freezer, 48-bottle wine cooler, six-burner Viking convection range with vented hood and built-in microwave, and Bosch dishwasher.

The primary suite is a true retreat, featuring an enormous walk-in closet complemented by an additional bank of in-room closets, blackout shades, and a spa-caliber en suite bathroom with a soaking tub, separate stall shower, and double vanity.

A dedicated media room with a 100-inch screen-easily convertible to an additional bedroom-a private home office with an en suite bath, and two additional well-proportioned bedrooms complete the layout with exceptional versatility. There are also 4.5 bathrooms throughout the home.

Additional features include two-zone central air conditioning, a commercial-grade washer and dryer, overhead lighting, a generous closet and storage space, and a Crestron smart home system.

Infinity Flats is a boutique condominium comprised of just eight full-floor residences, offering a full-time cyber doorman, exceptional privacy, and remarkably low carrying costs. With coveted north and south exposures, impressive scale, complete floor-through privacy, and undeniable downtown cachet, residences of this caliber are rarely available at this price per square foot.

Features & Amenities

Interior Features

Building None

Exterior Features

None

Building Amenities

Bike Storage Elevators

Appliances

Washer Dryer Allowed

Building Information

Financial Details

Common Charges $3,107/mo
RE Taxes Contact for details

The Flatiron District is a busy intersection of history, technology, and luxury living. Named after the iconic Flatiron Building, the neighborhood is centered around Madison Square Park and is a hub for the city's 'Silicon Alley.' The real estate market is famous for its grand cast-iron loft buildings with high ceilings and expansive floor plans, alongside ultra-luxury glass towers that offer modern amenities and central Manhattan convenience.

Flatiron Live Market Data

View Neighborhood

Active Listings

138

Median Asking Price

$2.46M

Median $/Sqft

$1,797

Avg Days on Market

N/A

New This Week

7

Price Reduced

34%

Sold (30 Days)

11

Median Sale Price

$2.24M

Live data from RLS at REBNY • Updated 6/2/26, 1:19 PM EST

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Location

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24 E 21ST Street #2, Flatiron, New York County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

1925
Year Built
101 years old
2
Floors
3
Residential Units
R5B
Zoning District
Walk-Up Apartments

Tax & Assessment

Assessed Value: $78,960
Land Value: $12,240
Exemptions: $0

Note: Individual unit taxes may differ. Verify current tax bills with NYC DOF.

Lot Area: 1,999 SF
Building Area: 2,080 SF
Built FAR: 1.04
Allowed FAR: 1.5

Source: NYC PLUTO (Primary Land Use Tax Lot Output), NYC Department of City Planning (data.cityofnewyork.us)

Want help estimating ownership costs or understanding building compliance? Let's discuss

Frequently Asked Questions

Common questions about this property

The current listed common charges are $3,107 per month. Confirm the exact amount with the listing broker before making an offer.

This property has 3 bedrooms and 4 full bathrooms and 1 half bathroom.

The listed interior living area is 4,073 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1935, making it approximately 91 years old.

This listing is a condominium. Buyers receive a deed to their individual unit and own their space outright, subject to condo association rules.

Pets are permitted at this property. Contact the listing broker for weight limits or breed restrictions.

At the current list price of $5,650,000 for 4,073 sq ft, the asking price per square foot is approximately $1,387. This figure is for reference only and may differ from appraised or assessed values.

To schedule a private showing, contact Milton Coste at (917) 416-7433 or mcoste@kwnyc.com. Per REBNY guidelines effective 2025, a Buyer Representation Agreement is required before a buyer's broker can show you properties. You may attend open houses independently without one.

Have a question not answered here?

(917) 416-7433
MLS® ID: RLS20095004
First Listed: 6/2/2026
On Market: 6/2/2026
Price Changed: 6/2/2026
Contract Date: 6/2/2026

Listing Courtesy of Corcoran Group - Deborah A Kern

Listing Contact: (917) 710-1150

Listing information for certain New York City properties provided courtesy of the Real Estate Board of New York's Residential Listing Service (the "RLS"). The information contained in this listing has not been verified by the RLS and should be verified by the consumer. The listing information provided here is for the consumer's personal, non-commercial use. Retransmission, redistribution or copying of this listing information is strictly prohibited except in connection with a consumer's consideration of the purchase and/or sale of an individual property. This listing 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. This advertisement does not suggest that the broker has a listing in this property or properties or that any property is currently available.

Broker Commission Disclosure: Broker commissions are not set by law and are fully negotiable.

Buyer Notice: Planning to work with a buyer's broker? A Buyer Representation Agreement is required before your broker can show you properties, per REBNY/UCBA guidelines (effective 2025). You may attend open houses independently without one.

RLS at REBNY

RLS Data display by Keller Williams NYC. Data last updated on 6/2/2026 at 5:19 PM UTC

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