SOLD FOR $13,500,000
· Closed September 9, 2021
15 Union Square W #Penthouse
MLS® #RLS10614054
Listing by The Corcoran Group
3
Bedrooms
3.5
Baths
3,164
Sq. Ft.
1900
Year Built
Quick Summary
Property Highlights
- Views: City
- Exposure: East,North,South,West facing
- Outdoor Space: Terrace, Rooftop
Property Details
Listing History
| Event | Date | Price | Change |
|---|---|---|---|
| Listed | Apr 10, 2019 | $15,750,000 | - |
| Currently | May 18, 2026 | $13,500,000 | -14.3% |
Description
Reintroducing the ultimate in Penthouse living, this truly one-of-a-kind home features over 5,000 SF of extraordinary indoor and outdoor living spaces with incredible custom details and skyline views. Completely redesigned by D?Apostrophe, the 3 bedroom and 3.5 bath residence has expansive private outdoor space on both the upper and lower levels. Premium upgrades grace the ambience throughout, such as beautiful 6? white oak plank hardwood floors, custom espresso stained white oak paneling, and superior total home technology that affords a seamless luxury lifestyle. A private entrance awaits off the dual elevators, leading into a gracious gallery. Beyond is a wonderful open-concept great room with floor-to-ceiling windows flooding the space with natural light. The dramatic living and dining room with a gas-burning fireplace is a perfect backdrop for entertaining. Take the party outside to enjoy al fresco dining and cocktail parties on the lower level terrace with a built-in grill, modern dining pergola, and awe-inspiring vistas. Back inside, the chef is busily preparing delicacies in the sleek open kitchen, connected to the dining area by a large marble-topped island. This inspiring culinary setting is also adorned with rift-cut oak wood cabinetry, punctuated by top-of-the-line appliances by Viking, Sub-Zero and Miele. The main level also presents 2 bedrooms overlooking the park, complemented by en-suite baths with travertine marble floors, bleached oak vanities with Corian counter, and nickel-plated fixtures. The powder room is outfitted with a custom concrete sink and adjoins a separate laundry room with washer and dryer. The peaceful upper level, accessed by a floating staircase, is reserved for the serene primary bedroom suite, which opens onto a private rooftop terrace with an outdoor fireplace and hot tub for the ultimate relaxation. A windowed walk-in closet, and elegant en-suite bath with a wet room shower, 2 TVs with surround sound, a double-sink marble vanity, Toto toilet and heated floors enhance the pampered experience. At the touch of a finger, the home automation system, powered by Savant and monitored by OneButton, allows you control of all lighting, window shades, HVAC, TV, music and security. 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, onsite concierge services, spa with a 50? lap pool, oversized whirlpool, state-of-the-art fitness center with yoga studio and a recreation room. The premier location at Union Square Park is in the heart of it all, near incredible cafes and restaurants, and premier shopping. There is a 1% transfer fee to be paid by the purchaser.
Features & Amenities
Interior Features
Exterior Features
Appliances
Building Information
Financial Details
About Flatiron
View All Flatiron ListingsThe 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 NeighborhoodActive 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, 2:01 PM EST
Similar Listings in Flatiron
View All10 MADISON Square #8G
Condo • RLS #RLS20081223
17 E 17TH Street #5
Condo • RLS #RLS20091886
17 W 17TH Street #6
Co-op • RLS #RLS20088979
4 W 21ST Street #7B
Condop • RLS #RLS20091794
22 E 18th Street #4E
Co-op • RLS #RLS20091842
60 W 20TH Street #PHA
Condo • RLS #RLS20091832
Browse More NYC Properties
In This Neighborhood
By Property Type
By Borough
Location
15 Union Square W #Penthouse, Flatiron, New York County • Near Union Square West & East 15th Street
Floor Plans
Building Information
Official NYC property records for this building
Tax & Assessment
Note: Individual unit taxes may differ. Verify current tax bills with NYC DOF.
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
Listing Data
RLS® at REBNY (Real Estate Board of New York) via Trestle API. Updated in real-time.
Building Data
NYC PLUTO (Primary Land Use Tax Lot Output), NYC Department of City Planning. Updated quarterly.
Market Data
RLS® at REBNY (Real Estate Board of New York). Live data updated in real-time.
Map & Location
OpenStreetMap contributors via Leaflet. Geocoding via Nominatim.
All data is provided for informational purposes only and should be independently verified. See our Data Sources Policy for more information.
Frequently Asked Questions
Common questions about this property
The current listed common charges are $8,255.44 per month. Confirm the exact amount with the listing broker before making an offer.
The current listed annual property tax is $75,730.2, or roughly $6,311 per month. Verify the current assessment with your attorney before closing.
This property has 3 bedrooms and 3 full bathrooms and 1 half bathroom.
The listed interior living area is 3,164 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 $13,500,000 for 3,164 sq ft, the asking price per square foot is approximately $4,267. 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) 416-7433Listing Courtesy of The 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 Data display by Keller Williams NYC. Data last updated on 5/18/2026 at 6:01 PM UTC