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909 Union Street
909 Union Street
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909 Union Street
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909 Union Street
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Sold

909 Union Street

909 Union Street, Brooklyn, NY 11215

$4,700,000
An amazing opportunity in a perfect Park Slope location! 909 Union Street is a five-story brick-and-limestone townhouse, currently configured as an owner's lower duplex with three simplex apartments above. Spanning approximately 5,300 square feet, it offers true flexibility: hold as a high-performing four-unit rental, convert to condos, or enjoy the mint owner's duplex with substantial rental income upstairs.

The owner's duplex has been thoughtfully renovated for effortless living. The parlor level delivers a nearly 60-foot great-room experience-an oversized living room and generous dining area, all designed to host beautifully. The chef's kitchen is a standout, featuring Bilotta cabinetry, Viking and Bosch appliances, and a River Granite center island with a prep sink, plus dual wall ovens (standard + convection) and a six-burner cooktop-a true cook's dream. The kitchen opens onto a spacious deck, which flows down to the back garden. A renovated powder room is also found on this level.

Downstairs, the garden level features a large bedroom and media room (currently used as the second bedroom). The primary suite opens directly to the garden. The en-suite bath is spa-like, with radiant heated floors, a double vanity, and a jacuzzi tub. A second full bath offers a marble shower and elegant marble-accented flooring. Carrara marble floors throughout the level are among the most recent upgrades, and the large utility/laundry room provides generous storage.

The three upper floors are configured as three charming two-bedroom residences, each with a washer/dryer and dishwasher, plus classic details like decorative moldings and fireplace mantels. The top-floor living room is crowned by a dramatic original stained-glass window-an unforgettable finishing touch.

Situated in the heart of Park Slope, within the original Park Slope Historic District, this home is moments from Grand Army Plaza, Prospect Park, the Brooklyn Museum, the Brooklyn Botanic Garden, Union Market, and access to the B/Q and 2/3 subway lines.

7
beds

6
baths

1,000 Sq.Ft. LIVING AREA

1,800 Sq.Ft. lot

Nancy Halpern

Nancy Halpern

Features & Amenities

Interior

  • total bedrooms7
  • Total bathrooms6
  • full bathrooms5
  • half bathroom1
  • Laundry room Washer Hookup, In Unit, See Remarks
  • Fireplace Decorative
  • other interior Features High Ceilings, Smoke Free

Area & Lot

  • Status Sold
  • Date Sold August 10, 2026
  • Living Area1,000 Sq.Ft.
  • Total Area1,000 Sq.Ft.
  • Lot Area1,800 Sq.Ft.
  • MLS® IDRLS20076927
  • TypeTownhouse
  • YEAR BUILT1920
  • View DescriptionOther

Exterior

  • STORIES4
  • PoolBuilding None
  • AIR CONDITIONINGCentral Air, Other
  • other exterior FeaturesPrivate Outdoor Space Over 60 Sqft

Financial

  • Sales Price$4,700,000
  • Real Estate Tax $25,920/yr

Work With Nancy

She has deep experience handling rentals, resales, townhouses, co-ops, condo conversions, and new developments across Manhattan. She knows the ins and outs of New York City living and can offer practical and valuable insights. She has worked at some of the city’s top brokerages and was a recipient of the Diamond Award—which recognizes the top 3% of agents company-wide.

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