Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433

SOLD FOR $4,750,000

Listed at $5,850,000 · Sold 18.8% below asking · Closed May 4, 2021

31 W 21ST Street #4
Closed For Sale Condo

$5,850,000

$1,241 per sq ft

31 W 21ST Street #4

Flatiron, Manhattan

MLS® #RLS10607555

RLS at REBNY

Listing by The Corcoran Group

3

Bedrooms

3

Baths

4,713

Sq. Ft.

1907

Year Built

Quick Summary

Bedrooms 3
Bathrooms 3
Living Area 4,713 sq ft
Year Built 1907
Ownership Condo
HOA/Common Charges $2,750/mo
Property Taxes $56,040/yr
Neighborhood Flatiron
Floor 4 of 11

Property Highlights

  • Exposure: North,South,West facing
  • Style: Prewar architecture
  • Climate Control: Central Air

Property Details

Type Condo
Ownership Condominium
Baths 3 Full
Floor 4 of 11
Exposure North,South,West
Cooling Central Air
Pets Yes
Cross Street 5 AVENUE and AVENUE OF THE AMERICAS
Year Built 1907
Living Area 4,713 sq ft
Architectural Style Prewar
Parcel # 0823-1205

Listing History

Event Date Price Change
Listed Mar 28, 2019 $6,250,000 -
Currently May 18, 2026 $5,850,000 -6.4%

Description

Spectacular 4,713 square foot loft with towering 11?-5? high ceilings, three exposures and twenty-four double-sets of Citiquiet windows is in a highly sought after boutique prewar condominium. A keyed elevator opens to a stunning residence with a 45 foot x 36 foot entertaining space, a pocket home office, grand dining space and open professional sized kitchen. The newly renovated kitchen has two preparation islands with 2? thick marble countertops that cascade to the polished concrete floor. The Rejuvenation lighting is thoroughly original. A breakfast bar seats four, and overlooks the sprawling counter tops, custom designed cabinetry with soft-close drawers and doors, interior lighting, four pull-out pantry cabinets with rotating Hafele interiors, two pot drawers and incredible amount of storage. Appliances include two full-size ovens, a wall steam oven and microwave and 5-burner cook top all by Wolf. The oversized Sub-Zero refrigerator is finished to matched the cabinetry and there are two separate Sub-Zero freezer drawers, and a Bosch dishwasher. The back splash is French antiqued silver mirrored tiles and the face of the underlit breakfast bar is finished with distressed gold-leaf tiles, all from Ann Sacks. This is an ideal space for those who love to entertain. The guest powder room cleverly becomes a second en-suite full bathroom for the corner primary suite, giving it two full baths. There are two walk-in closets large enough to function as dressing rooms. The spa-like primary bath has dual sinks, an enormous walk-in steam shower with rain head and multiple wall jets, and an oversized whirlpool tub. There is a large study complete with built in bookcases, and cabinets creating a perfect reading room or home office. The current layout has a partitioned guest bedroom and an enormous media room, which can easily become three proper sized bedrooms. Additionally, there is a separate office and a third full bath. The mechanical room houses the central air and humidification systems plus additional storage. Leading to the laundry room, there is a second large refrigerator, tons of storage cabinets and shelves. The laundry room has plenty of storage as well as a utility closet that houses an extra water heater for the unit. This boutique condominium, built in 1910 and converted to a condominium in 2001, has 12 floors and 11 residences. The building has a managing superintendent and two elevators?one passenger and one large service. Perfectly situated in the heart of the Flatiron District, near Madison Square Park, Union Square, Trader Joes, Whole Foods, Eataly, fine dining, wonderful shopping and convenient transportation.

Features & Amenities

Interior Features

Den Separate Formal Dining Room Eat In Kitchen Building Washer Dryer Install Allowed Common On Floor

Appliances

Dryer Washer

Building Information

Building Data View Compliance & Permits
Total Units 11
Stories 11
Style Prewar

Financial Details

Common Charges $2,750/mo
RE Taxes $56,040/yr ($4,670/mo)
Original Price $6,250,000
Sale Price $4,750,000

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

139

Median Asking Price

$2.42M

Median $/Sqft

$1,788

Avg Days on Market

N/A

New This Week

12

Price Reduced

32%

Sold (30 Days)

4

Median Sale Price

$1.55M

Live data from RLS at REBNY • Updated 5/18/26, 6:11 PM EST

Similar Listings in Flatiron

View All

Location

Loading map...

31 W 21ST Street #4, Flatiron, New York County • Near 5 AVENUE and AVENUE OF THE AMERICAS

Floor Plans

Floor Plan 1
Floor Plan 2

Building Information

Official NYC property records for this building

1924
Year Built
102 years old
5
Floors
R6B
Zoning District

Tax & Assessment

Assessed Value: $6,821,550
Land Value: $1,660,500
Exemptions: $6,821,550

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

Lot Area: 68,000 SF
Building Area: 108,500 SF
Built FAR: 1.6
Allowed FAR: 2

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 $2,750 per month. Confirm the exact amount with the listing broker before making an offer.

The current listed annual property tax is $56,040, or roughly $4,670 per month. Verify the current assessment with your attorney before closing.

This property has 3 bedrooms and 3 full bathrooms.

The listed interior living area is 4,713 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1907, making it approximately 119 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 $5,850,000 for 4,713 sq ft, the asking price per square foot is approximately $1,241. 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: RLS10607555
First Listed: 3/28/2019
Closed: 5/4/2021
Contract Date: 4/24/2019

Listing Courtesy of The Corcoran Group - Amy Katcher

Listing Contact: (917) 678-4719

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 5/18/2026 at 10:11 PM UTC

Buying a Condo? Start Here

Co-op vs. Condo: Which Is Right for You?

Ownership structure, board approval, financing: the full comparison.

Read article

Condo Due Diligence Checklist

What to review before signing: financials, reserve fund, offering plan.

Read article

How to Read a Condo Offering Plan

Decode the offering plan before you commit to any new development.

Read article

NYC Mansion Tax: 2026 Guide

How the tiered mansion tax works for purchases over $1M.

Read article

Interested in this property?

Your info is secure and never shared.

View Active Listings Call Milton