Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433

SOLD FOR $4,025,000

· Closed October 30, 2025

15 UNION Square W #4E
Closed For Sale Condo

$4,025,000

$1,507 per sq ft

15 UNION Square W #4E

Flatiron, Manhattan

15Usw

MLS® #RLS20003706

RLS at REBNY

Listing by Corcoran Group

3

Bedrooms

3.5

Baths

2,670

Sq. Ft.

1870

Year Built

Quick Summary

Bedrooms 3
Bathrooms 4 full, 1 half
Living Area 2,670 sq ft
Year Built 1870
Ownership Condo
HOA/Common Charges $7,401/mo
Property Taxes Contact for details
Parking Garage
Neighborhood Flatiron
Floor 4 of 12

Property Highlights

  • Views: City, Park Greenbelt
  • Exposure: North,South facing
  • Parking: Private garage

Property Details

Type Condo
Ownership Condominium
Total Rooms 9
Baths 3 Full, 1 Half
Floor 4 of 12
View City, Park Greenbelt
Exposure North,South
Pets Yes
Year Built 1870
Living Area 2,670 sq ft
Parking Garage Available
Structure Type HighRise
Basement Other
Block/Lot 00842/1118

Listing History

Event Date Price Change
Listed Jan 27, 2025 $4,250,000 -
Currently May 9, 2026 $4,025,000 -5.3%

Description

This exceptional designer home at 15 Union Square West offers the best of NYC living with dramatic ceiling heights, stunning arched windows, and complete serenity across two levels. Located in the heart of Downtown at the intersection between Greenwich Village, Gramercy Park, and Flatiron, Union Square Park provides a backyard setting with 6.5 acres of green space and a weekly farmer's market.

The bright, open great room is the heart of the residence, featuring soaring 17-foot double-height ceilings and iconic North-facing arched cast-iron window frames from the original Tiffany's building, now set behind a sleek glass facade. The expansive space accommodates oversized furniture, a 10-seat dining table, and a built-in dry bar with lit glassware cabinetry, making it perfect for living and entertaining.

The kitchen seamlessly connects to the living area, sharing the same North-facing views and abundant natural light. It boasts an elongated Calacatta marble island, top-tier stainless steel appliances-including a Viking six-burner gas range, Sub-Zero refrigerator, and wine cooler-and sleek white cabinetry complemented by a stainless steel backsplash and contemporary lighting.

A stainless steel and glass staircase leads to the private master suite, a spacious oasis with southern exposures, two oversized windows, two expansive closets, and room for additional furniture or a workstation. The en-suite bathroom features custom-designed finishes by Vicente Wolf, a double sink vanity, a wet room with dual shower heads, and a claw-foot soaking tub.

The lower level offers two generous secondary bedrooms with en-suite bathrooms, custom closets, and southern exposures. A mahogany-paneled powder room on the main level conceals a laundry closet with a full-sized Miele washer and dryer. Additional storage includes a foyer closet and linen closets on the upper level. Other highlights include mahogany flooring, central HVAC, and an integrated Crestron system for shading, lighting, and climate control.

A conversion of Tiffany & Company's 19th century headquarters, 15 Union Square West is a coveted high-end boutique condominium with hotel-like amenities including a 24-hour doorman, on-site concierge services, a zen spa with a 50' lap pool, oversized whirlpool, state-of-the-art fitness center with yoga studio and a recreation room. The premier location is in the heart of it all, near incredible cafes and restaurants, and the best of Fifth Avenue shopping.

This is a co-listing with Compass/Corcoran. Please contact us to schedule a viewing.

Features & Amenities

Interior Features

Dining Area Building Other In Unit

Exterior Features

Private Outdoor Space Under60 Sqft

Building Amenities

Concierge Indoor Pool Sauna Spa Hot Tub Sauna

Appliances

Washer Dryer Allowed

Building Information

Building 15Usw
Building Data View Compliance & Permits
Total Units 36
Stories 12
Structure HighRise

Financial Details

Common Charges $7,401/mo
RE Taxes Contact for details
Original Price $4,250,000
Sale Price $4,025,000
Previous Price $4,250,000

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

134

Median Asking Price

$2.25M

Median $/Sqft

$1,761

Avg Days on Market

N/A

New This Week

14

Price Reduced

31%

Sold (30 Days)

11

Median Sale Price

$2.16M

Live data from RLS at REBNY • Updated 5/9/26, 9:39 AM EST

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Location

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15 UNION Square W #4E, Flatiron, New York County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

1900
Year Built
126 years old
12
Floors
34
Residential Units
C6-4
Zoning District
Condominiums

Tax & Assessment

Assessed Value: $28,606,533
Land Value: $2,250,008
Exemptions: $0

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

Lot Area: 12,915 SF
Building Area: 89,289 SF
Built FAR: 6.91
Allowed FAR: 10

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 $7,401 per month. Confirm the exact amount with the listing broker before making an offer.

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

The listed interior living area is 2,670 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1870, making it approximately 156 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 $4,025,000 for 2,670 sq ft, the asking price per square foot is approximately $1,507. 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 [email protected]. 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: RLS20003706
First Listed: 2/18/2025
On Market: 1/27/2025
Price Changed: 11/3/2025
Closed: 10/30/2025
Contract Date: 2/18/2025

Listing Courtesy of Corcoran Group - Dana Power

Listing Contact: (917) 209-4550

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 5/9/2026 at 1:39 PM UTC

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