Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433

Sold on 10/30/2025 for $4,025,000

Closed For Sale Condo

$4,025,000

$1,507 per sq ft

15 Union Square W #4E

Flatiron, Manhattan

MLS® #RLS20003786

RLS at REBNY

Listing by Compass

3

Bedrooms

4.5

Baths

2,670

Sq. Ft.

1900

Year Built

Quick Summary

Bedrooms 3
Bathrooms 4 full, 1 half
Living Area 2,670 sq ft
Year Built 1900
Ownership Condo
HOA/Common Charges $7,400/mo
Property Taxes $61,644/yr
Neighborhood Flatiron
Floor 4 of 12

Property Highlights

  • Exposure: South facing
  • Climate Control: Central Air
  • Character: Pre-war building (1900)

Property Details

Type Condo
Ownership Condominium
Total Rooms 8
Baths 3 Full, 1 Half
Floor 4 of 12
Exposure South
Heating Central
Cooling Central Air
Pets Yes, CatsOk, DogsOk
Year Built 1900
Living Area 2,670 sq ft
Structure Type MixedUse
Flooring Hardwood
Furnished Unfurnished
Block/Lot 00842/1118

Description

This exceptional designer residence 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. 18 square feet of on-site private resident storage included. 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. Please contact us to schedule a viewing.

Features & Amenities

Interior Features

High Ceilings Kitchen Island Soaking Tub Sauna Walk In Closets Common On Floor Common Area Flooring: Hardwood

Building Amenities

Elevators

Appliances

Dryer Refrigerator Stainless Steel Appliances Wine Cooler Washer

Building Information

Total Units 33
Stories 12
Structure MixedUse

Financial Details

Common Charges $7,400/mo
RE Taxes $61,644/yr ($5,137/mo)
Original Price $4,250,000
Sale Price $4,025,000
Previous Price $4,250,000

The Flatiron District is a vibrant 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

110

Median Asking Price

$2.73M

Median $/Sqft

$1,797

Avg Days on Market

N/A

New This Week

9

Price Reduced

30%

Sold (30 Days)

6

Median Sale Price

$2.95M

Live data from RLS at REBNY • Updated 3/1/26, 10:07 PM EST

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Location

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

Virtual Tour

MLS® ID: RLS20003786
First Listed: 2/18/2025
On Market: 2/18/2025
Price Changed: 10/30/2025
Closed: 10/30/2025
Contract Date: 11/15/2024

Listing Courtesy of Compass - Heather L Domi

Listing Contact: (917) 566-6644

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.

RLS at REBNY

RLS Data display by Keller Williams NYC. Data last updated on 3/2/2026 at 3:07 AM UTC

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