For Sale · Listing by Compass
748 Union Street
Park Slope, Brooklyn
$4,500,000
748 Union Street
MLS® #RLS20105856
Listing by Compass
- 5
- Bedrooms
- 4.5
- Baths
- 5,804
- Sq. Ft.
- 1915
- Year Built
Quick Summary
Property Highlights
- Outdoor Space: Deck, Terrace
- Climate Control: Central Air
- Character: Pre-war building (1915)
Property Details
Listing History
| Event | Date | Price | Change |
|---|---|---|---|
| Listed | Sep 16, 2026 | $4,500,000 | - |
| Currently | Sep 16, 2026 | $4,500,000 | - |
Description
A once-in-a-generation opportunity in the heart of Park Slope, 748 Union Street presents a rare chance to own a mixed-use property that has been held and cared for by the same owner for many years. Ideally positioned on one of Brooklyn’s most desirable neighborhood corridors, the property offers a flexible layout with commercial/garden-level space, residential upper levels, and multiple private outdoor areas. With its combination of location, scale, and long-term ownership history, 748 Union Street is well-suited for end-users, investors, or those seeking a unique live/work opportunity in a prime Park Slope setting. Moments from neighborhood conveniences, dining, coffee shops, transit, and Prospect Park, this is a truly special offering in one of Brooklyn’s most established and sought-after communities. Contact us for setup
Features & Amenities
Interior Features
Exterior Features
Building Information
Financial Details
About Park Slope
View All Park Slope ListingsPark 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 NeighborhoodActive Listings
77
Median Asking Price
$2.00M
Median $/Sqft
$1,389
Avg Days on Market
N/A
New This Week
21
Price Reduced
13%
Sold (30 Days)
42
Median Sale Price
$1.70M
Live data from RLS at REBNY • Updated 9/16/26, 6:52 PM EST
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Location
748 Union Street, Park Slope, Kings County
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 $0 per month. Confirm the exact amount with Milton Coste before making an offer.
The current listed annual property tax is $16,831.44, or roughly $1,403 per month. Verify the current assessment with your attorney before closing.
This property has 5 bedrooms and 4 full bathrooms and 1 half bathroom.
The listed interior living area is 5,804 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
Pet policy requires confirmation with Milton Coste.
At the current list price of $4,500,000 for 5,804 sq ft, the asking price per square foot is approximately $775. 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) 416-7433Listing Courtesy of Compass - James Fierro Jr
Listing Contact: (716) 930-5802
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 9/16/2026 at 10:52 PM UTC
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Quick Facts
Monthly Costs Estimate
$900,000
Source: Freddie Mac PMMS
Est. Monthly Payment
$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 $3M to $4,999,999 at 1.50%, applied to the whole purchase price. It is due in cash at closing and cannot be financed.
Estimated mansion tax at asking
$67,500
Estimate based on the asking price. Confirm your own obligation with your real estate attorney.
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