Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
894 UNION Street

For Sale · Listing by Corcoran Group

894 UNION Street

Park Slope, Brooklyn

$5,750,000

Interested in this property?
Active For Sale • Multi Family

$5,750,000

$1,187 per sq ft

894 UNION Street

Park Slope, Brooklyn

MLS® #RLS20120343

RLS at REBNY

Listing by Corcoran Group

4
Bedrooms
4.5
Baths
4,846
Sq. Ft.
1915
Year Built

Quick Summary

Bedrooms 4
Bathrooms 5 full, 2 half
Living Area 4,846 sq ft
Lot Size 1,995 sq ft
Year Built 1915
Ownership None
Property Taxes $27,444/yr
Neighborhood Park Slope
Floor 1 of 3

Property Highlights

  • Views: Other
  • Outdoor Space: Deck, Balcony
  • Fireplace: 1 fireplace

Property Details

Type Multi Family
Ownership None
Total Rooms 18
Baths 4 Full, 2 Half
Floor 1 of 3
View Other
Cooling Ductless
Pets Yes
Year Built 1915
Living Area 4,846 sq ft
Structure Type Townhouse
Basement Other
Lot Size 1,995 sq ft
Parcel # 01066-0018
Block/Lot 01066/0018

Listing History

Event Date Price Change
Listed Oct 10, 2026 $5,750,000 -
Currently Oct 11, 2026 $5,750,000 -

Description

This distinguished landmarked 21 ft. wide Neo-Grec brownstone has been lovingly maintained and thoughtfully upgraded by its current owners for more than two decades. Well-positioned on one of Park Slope's most coveted blocks between Prospect Park West and Eighth Avenue, close to Grand Army Plaza and Prospect Park, this legal four-family townhouse is currently configured as a three-family home, offering an ideal balance of luxurious owner occupancy and strong income potential. The owners' residence occupies the garden and parlor levels in a beautifully appointed 2-bedroom, 2.5-bath duplex , where thoughtful renovations complement the home's extraordinary nineteenth-century craftsmanship. Mitsubishi & LG mini-split systems provide efficient heating and cooling, while all-new Marvin windows installed throughout the townhouse between 2014 and 2015 enhance comfort and performance while preserving the residence's historic character. Soaring ceilings and graciously proportioned rooms showcase a remarkable collection of original details. The parlor level retains its magnificent mahogany staircase, richly detailed mahogany moldings and window casings, elegant wainscoting, window shutters, pocket doors and original dining room mantel, all preserved in exceptional condition. Upstairs, finely crafted oak millwork continues the home's architectural story, reflecting the quality and artistry of its original construction. The parlor-level kitchen opens to a beautifully designed outdoor retreat, featuring a custom steel & Ipe wood deck installed in 2016 with a staircase leading directly to the backyard. Designed as a private urban sanctuary, the garden features a tranquil Zen-inspired landscape with bamboo fencing, bluestone pavers, and custom terracotta tile details, creating a serene extension of the living space perfect for entertaining, gardening, or quiet moments outdoors. Below the duplex, a fully finished lower level reveals an extraordinary surprise: a custom retro-inspired movie theater designed by the previous owner, Theo Kalomirakis, widely regarded as the father of luxury home theater design. This remarkable screening room served as the prototype for what would become his internationally acclaimed work and remains a truly unique amenity for film enthusiasts and entertainers alike. The upper floors are configured as two oversized one-bedroom, one-bath apartments , each thoughtfully designed with an additional home office or nursery. These generously scaled apartments offer excellent rental income potential while maintaining a high standard of comfort and livability. The top-floor residence is currently leased until April 2027 , providing a stable income stream for the next owner. Located within the coveted P.S. 321 school district , 894 Union Street enjoys one of Brooklyn's premier residential locations, just moments from Prospect Park, the Grand Army Plaza Greenmarket, Brooklyn Museum, Brooklyn Botanic Garden, acclaimed restaurants, cafés & boutiques on 7 th Avenue, plus multiple subway lines. Whether preserved as an elegant income-producing property, transformed into a spectacular single-family residence, or enjoyed as a sophisticated owner's home with substantial rental income, 894 Union Street is a rare offering that seamlessly blends historic provenance, meticulous stewardship, modern convenience, and enduring architectural beauty on one of Park Slope's most desirable landmarked blocks. Showings by appointment only.

Features & Amenities

Interior Features

High Ceilings Smoke Free Storage Walk In Closets Building Other Washer Hookup In Unit Fireplace (1)

Exterior Features

Balcony Private Outdoor Space Over60 Sqft Deck Balcony

Building Amenities

Green Building

Appliances

Dishwasher Washer Dryer Allowed

Building Information

Building Data View Compliance & Permits
Total Units 4
Stories 3
Structure Townhouse

Financial Details

RE Taxes $27,444/yr ($2,287/mo)

Park Slope is a well-known Brooklyn neighborhood, recognized for its tree-lined streets and preserved brownstones. Bordering the western edge of Prospect Park, the neighborhood offers convenient access to green space. The real estate market features a mix of historic townhouses, cooperatives, and modern condominiums, within walking distance of the park.

Park Slope Live Market Data

View Neighborhood

Active Listings

105

Median Asking Price

$1.70M

Median $/Sqft

$1,331

Avg Days on Market

N/A

New This Week

10

Price Reduced

10%

Sold (30 Days)

19

Median Sale Price

$1.75M

Live data from RLS at REBNY • Updated 10/10/26, 9:37 PM EST

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Location

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894 UNION Street, Park Slope, Kings County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

1887
Year Built
139 years old
3
Floors
4
Residential Units
R7B
Zoning District
Walk-Up Apartments Historic District: Park Slope Historic District

Tax & Assessment

Assessed Value: $1,112,400
Land Value: $321,300
Exemptions: $0

Note: Individual unit taxes may differ. Verify current tax bills with NYC DOF.

Lot Area: 1,995 SF
Building Area: 3,465 SF
Built FAR: 1.74
Allowed FAR: 3

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 annual property tax is $27,444, or roughly $2,287 per month. Verify the current assessment with your attorney before closing.

This property has 4 bedrooms and 4 full bathrooms and 2 half bathrooms.

The listed interior living area is 4,846 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1915, making it approximately 111 years old.

This listing is None

Pets are permitted at this property. Contact Milton Coste for weight limits or breed restrictions.

At the current list price of $5,750,000 for 4,846 sq ft, the asking price per square foot is approximately $1,187. 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 milton@miltoncoste.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) 416-7433
MLS® ID: RLS20120343
First Listed: 10/10/2026
On Market: 10/10/2026
Price Changed: 10/10/2026
Contract Date: 10/10/2026

Listing Courtesy of Corcoran Group - Dario Nolfi

Listing Contact: (646) 269-5927

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.

How working with a buyer's agent works: I work for you, not the seller. Before I show you anything, New York brokerage rules ask us to put that in writing. The agreement is non-exclusive: you can work with other agents, it runs for a short fixed term we agree on, and you can end it with a note. You may attend open houses independently without an agreement. Read how it works

RLS at REBNY

RLS Data display by Keller Williams NYC. Data last updated on 10/11/2026 at 1:37 AM UTC

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Milton Coste - NYC Real Estate Broker

Milton Coste

Licensed Real Estate Associate Broker

Keller Williams NYC

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Sale history, taxes, violations and comps for this unit

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Park Slope Market Update

19 sales last 30 days · $1.70M median · 5.5 months supply

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Quick Facts

Status Active Type Multi Family Neighborhood Park Slope Borough Brooklyn
County Kings
Floor 1 of 3
Year Built 1915
First Listed 10/10/2026
Living Area 4,846 sqft
Annual Tax $27,444

Monthly Costs Estimate

Down Payment 20%

$1,150,000

Interest Rate Loading...

Source: Freddie Mac PMMS

Loan Term 30 years

Est. Monthly Payment

$0

Principal & Interest $0
PMI (under 20% down) $0
Est. Taxes $2,287
Total Monthly $0

Estimates only. Consult a lender for exact figures.

Mansion tax applies at this price point

New York State charges the buyer a mansion tax on residential purchases at $1,000,000 or more. At this asking price the tier is $5M to $9,999,999 at 2.25%, applied to the whole purchase price. It is due in cash at closing and cannot be financed.

Estimated mansion tax at asking

$129,375

Run the numbers on a different offer price

Estimate based on the asking price. Confirm your own obligation with your real estate attorney.

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