Seller's Agent in 2025
Mara Flash Blum
Sothebys International Realty
(917) 607-7456
7 in this area
68 Total Sales
An Idyllic, peaceful penthouse designed with the colors of the ocean is a perfect retreat from city life. Shades of blue, sand and white evoke an immediate sense of calm as the elevator door opens into a private oasis. Perfectly curated, this palatial 4-bedroom, 4.5 bath penthouse boasts over 5,300 SF of indoor and outdoor living with a great room that delivers grand and gracious entertaining. With full-service doorman services and private keyed elevator access, the residence offers the ultimate in discretion and exclusivity, combining expansive scale with refined architectural detailing. BBQ year round on your south facing terrace with Weber gas grill. Whether inside or out, experience grand scale dining that can accommodate large gatherings. The elegantly appointed double living room has both fireplace seating and a comfortable lounging area. An artist paradise, high ceilings, gallery-sized walls and niches are perfect for a curated art collection. Interior living expands to exterior living with folding terrace doors allowing for a sun-splashed perennial garden to enjoy all year long. The eat-in chef’s kitchen has counter-top dining for four and dining table for four. Beautiful stone and oak wood cabinetry in sandy tones in the kitchen are simply magnificent. The chef’s kitchen is a study in elevated utility and minimalist elegance, outfitted with Miele, Julien, and Grohe appliances, custom white oak cabinetry, a 10.5-foot marble island, and a concealed butler’s pantry. Adjacent, a flexible entertainment/media room or library can be enclosed for privacy with glass ribbed and steel pocket doors or opened for expansive hosting.
The primary suite occupies its own private wing, with sitting areas, dual custom wardrobes, a midnight kitchenette, and direct access to its southern terrace. The spa-quality, five-fixture bath includes a freestanding LaCava tub, radiant heated floors, and a walk-in rain shower — relax in an at-home sumptuous sanctuary. Three additional ensuite bedrooms provide private refuges, each with generous walk-in closets. There is voluminous closet space as well as two private storage room included with the sale. The flexible floorplan allows the many rooms to be customized and designed for your personal lifestyle. Home offices, libraries or winged children’s bedrooms. Designed with state-of-the-art home technology in mind, the residence is fully integrated with Savant Home Automation, electronic window treatments, a Sonos sound system, and a sophisticated lighting and climate control infrastructure.
Perched atop one of Flatiron’s most distinguished boutique buildings, The Penthouse at 21W20 is a full-floor masterpiece. With two private terraces totaling over 540 sq. ft., bespoke finishes, and light-filled entertaining spaces, this penthouse stands as one of the most unique and undervalued opportunities currently available.
The Building: 21W20, designed by celebrated architect David Mann (MR Architecture + Decor), is a discreet luxury condominium with white-glove service, including a 24-hour doorman, private lounge, curated garden, refrigerated storage, and pet spa. This offering includes two deeded private storage rooms.
The Neighborhood: Located in historic, landmarked Flatiron District at the crossroads of Madison Square Park and the incomparable Union Square Farmer’s Market, reside in one of Manhattan’s most sought-after enclaves. Michelin star restaurants, Fifth Avenue shopping, ABC Carpet & Home, Whole Foods, Trader Joes, Eataly – live large amid one of the most exciting cities in the world.
Special assessment: $528.06/month from April 2025 to April 2027.
Last Agent to Sell the Property
Sothebys International Realty License #30BL0760099 Listed on: 06/02/2025
| Date | Event | Price | List to Sale | Price per Sq Ft | Prior Sale |
|---|---|---|---|---|---|
| 10/02/2025 10/02/25 | Sold | $9,950,000 | -15.3% | $2,055 / Sq Ft | |
| 08/19/2025 08/19/25 | Pending | -- | -- | -- | |
| 06/02/2025 06/02/25 | For Sale | $11,750,000 | +379.6% | $2,427 / Sq Ft | |
| 07/31/2024 07/31/24 | Sold | $2,450,000 | -1.8% | $1,882 / Sq Ft | View Prior Sale |
| 04/24/2024 04/24/24 | Pending | -- | -- | -- | |
| 03/15/2024 03/15/24 | For Sale | $2,495,000 | -73.3% | $1,916 / Sq Ft | |
| 01/10/2018 01/10/18 | Sold | $9,350,000 | -21.8% | $1,931 / Sq Ft | View Prior Sale |
| 12/11/2017 12/11/17 | Pending | -- | -- | -- | |
| 05/24/2017 05/24/17 | For Sale | $11,950,000 | +369.5% | $2,468 / Sq Ft | |
| 09/22/2016 09/22/16 | Sold | -- | -- | -- | View Prior Sale |
| 08/23/2016 08/23/16 | Pending | -- | -- | -- | |
| 08/04/2014 08/04/14 | For Sale | $2,545,000 | -- | $1,955 / Sq Ft |
Seller's Agent in 2025
Mara Flash Blum
Sothebys International Realty
(917) 607-7456
7 in this area
68 Total Sales
Seller Co-Listing Agent in 2025
Matt Perceval
Sothebys International Realty
(646) 284-8048
3 in this area
15 Total Sales
Seller's Agent in 2024
Ian Wolf
Compass
(212) 588-5608
2 in this area
17 Total Sales
Seller's Agent in 2018
Holly Parker
Compass
(917) 587-7288
3 in this area
127 Total Sales
Seller Co-Listing Agent in 2018
Michael Passaro
Douglas Elliman Real Estate
(917) 806-8213
50 Total Sales
Source: Real Estate Board of New York (REBNY)
MLS Number: RLS20028200