Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433

SOLD FOR $1,700,000

· Closed March 10, 2025

15 Union Square W #4C
Closed For Sale Condo

$1,700,000

$1,090 per sq ft

15 Union Square W #4C

Flatiron, Manhattan

MLS® #RLS10996433

RLS at REBNY

Listing by Compass

1

Bedroom

1.5

Baths

1,560

Sq. Ft.

1900

Year Built

Quick Summary

Bedrooms 1
Bathrooms 2 full, 1 half
Living Area 1,560 sq ft
Year Built 1900
Ownership Condo
HOA/Common Charges $4,341/mo
Property Taxes $36,156/yr
Neighborhood Flatiron
Floor 4 of 12

Property Highlights

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

Property Details

Type Condo
Ownership Condominium
Total Rooms 3
Baths 1 Full, 1 Half
Floor 4 of 12
Exposure North
Cooling Central Air
Pets Yes, CatsOk, DogsOk
Year Built 1900
Living Area 1,560 sq ft
Structure Type MixedUse
Flooring Hardwood
Furnished Unfurnished
Block/Lot 00842/0000

Listing History

Event Date Price Change
Listed Apr 29, 2024 $2,495,000 -
Price Reduced Mar 10, 2025 $2,150,000 -13.8%
Currently May 13, 2026 $1,700,000 -20.9%

Description

Spanning over 1,500 square feet, this designer loft is spacious, bright, and centrally located. Arches from the preserved original facade beautifully frame floor-to-ceiling windows, while the soaring 16-foot ceilings flood the space with natural light. The expansive living and dining area seamlessly blends into the open concept kitchen with top-of-the-line appliances such as a Subzero refrigerator and wine cooler, Viking range and hood, and a built-in Miele coffee machine. Additional conveniences on the main level include a powder room and an in-unit washer and dryer. A sleek metal staircase ascends to the second level of the residence, the primary suite. Features include an ensuite bath with a double vanity, walk-in shower, and stand-alone soaking tub. Additionally, there is a spacious walk-in closet, offering ample storage. Formerly the renowned Tiffany & Co headquarters, 15 Union Square West has been transformed into a distinguished 36-unit boutique condominium. Residents enjoy access to an array of five-star amenities in addition to the convenient location. These include a 24-hour doorman, concierge services by Luxury Attaché, a 50-foot lap pool, hot tub, saunas, massage room, and state-of-the-art fitness center with a yoga studio. Please note, there is a Flip Tax of 1% of the gross purchase due from the Purchaser at closing.

Features & Amenities

Interior Features

Double Vanity High Ceilings Recessed Lighting Soaking Tub Sauna Walk In Closets Common On Floor Common Area In Unit Flooring: Hardwood

Appliances

Range Hood Stainless Steel Appliances Wine Cooler Washer

Building Information

Building Data View Compliance & Permits
Total Units 33
Stories 12
Structure MixedUse

Financial Details

Common Charges $4,341/mo
RE Taxes $36,156/yr ($3,013/mo)
Original Price $2,495,000
Sale Price $1,700,000
Previous Price $2,150,000

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

$1,775

Avg Days on Market

N/A

New This Week

8

Price Reduced

32%

Sold (30 Days)

12

Median Sale Price

$2.54M

Live data from RLS at REBNY • Updated 5/13/26, 2:47 PM EST

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Location

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

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 $4,341 per month. Confirm the exact amount with the listing broker before making an offer.

The current listed annual property tax is $36,156, or roughly $3,013 per month. Verify the current assessment with your attorney before closing.

This property has 1 bedroom and 1 full bathroom and 1 half bathroom.

The listed interior living area is 1,560 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1900, making it approximately 126 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 $1,700,000 for 1,560 sq ft, the asking price per square foot is approximately $1,090. 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: RLS10996433
First Listed: 4/29/2024
On Market: 4/29/2024
Price Changed: 3/10/2025
Closed: 3/10/2025
Contract Date: 4/23/2024

Listing Courtesy of Compass - Stephen Ferrara

Listing Contact: (646) 761-7038

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 5/13/2026 at 6:47 PM UTC

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