Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
278 A 9th Street

For Sale · Listing by Sothebys International Realty

278 A 9th Street

Park Slope, Brooklyn

$1,950,000

Interested in this property?
Active For Sale • Triplex

$1,950,000

$1,003 per sq ft

278 A 9th Street

Park Slope, Brooklyn

MLS® #RLS20122806

RLS at REBNY

Listing by Sothebys International Realty

Open House Scheduled

Thursday, October 29 • 4:00 PM – 5:30 PM

REBNY 2025: signed Buyer Representation Agreement required before any showing.

3
Bedrooms
3
Baths
1,944
Sq. Ft.
1899
Year Built

Quick Summary

Bedrooms 3
Bathrooms 3
Living Area 1,944 sq ft
Year Built 1899
Ownership None
Property Taxes $7,128/yr
Neighborhood Park Slope
Floor 1 of 2

Property Highlights

  • Views: Neighborhood
  • Exposure: North,South facing
  • Character: Pre-war building (1899)

Property Details

Type Triplex
Ownership None
Total Rooms 6
Baths 3 Full
Floor 1 of 2
View Neighborhood
Exposure North,South
Pets Yes
Year Built 1899
Living Area 1,944 sq ft
Structure Type MultiFamily,Townhouse,Triplex
Furnished Unfurnished
Block/Lot 01010/0021

Listing History

Event Date Price Change
Listed Oct 26, 2026 $1,950,000 -
Currently Oct 28, 2026 $1,950,000 -

Description

An opportunity to reimagine a Park Slope townhouse. Welcome to 278A 9th Street, a three-level home on a charming block just a few blocks from Prospect Park. This property offers the chance to collaborate with your architect and contractor to create a home tailored to your vision, from the overall floor plan to the finishes throughout. The existing layouts include spacious areas, offering a starting point for exploring different configurations. Whether you prefer an open layout or separate living and dining areas, there’s room to create a home that suits your lifestyle. A large backyard adds another dimension to the property, with a patio directly off the current kitchen on the first level. Reimagined alongside the interiors, these outdoor spaces could accommodate dining, gardening, and relaxing, creating a natural extension of the home. For buyers considering an investment, the property offers the opportunity to explore its rental potential following a renovation. The location places neighborhood restaurants, cafés, and local shops within easy reach, with Prospect Park nearby for everything from morning walks to weekend recreation. The F and G trains are approximately two blocks away, along with access to multiple bus lines, while Barclays Center is a short train or car ride away. With three levels, generous outdoor space, and a sought-after Park Slope setting, 278A 9th Street invites a thoughtful transformation and a new chapter or opportunity. A unit on the third floor is currently occupied, and we do not have access to that floor until mid-November.

Features & Amenities

Interior Features

Entrance Foyer See Remarks

Exterior Features

Building Garden Private Outdoor Space Over60 Sqft Private Yard

Building Information

Building Data View Compliance & Permits
Total Units 3
Stories 2
Structure MultiFamily,Townhouse,Triplex

Financial Details

RE Taxes $7,128/yr ($594/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

106

Median Asking Price

$1.72M

Median $/Sqft

$1,396

Avg Days on Market

N/A

New This Week

6

Price Reduced

18%

Sold (30 Days)

25

Median Sale Price

$1.69M

Live data from RLS at REBNY • Updated 10/27/26, 11:05 PM EST

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Location

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278 A 9th Street, Park Slope, Kings County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

2007
Year Built
19 years old
16
Floors
283
Residential Units
C6-3A
Zoning District
Condominiums

Tax & Assessment

Assessed Value: $45,605,318
Land Value: $2,488,500
Exemptions: $0

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

Lot Area: 36,858 SF
Building Area: 281,549 SF
Built FAR: 7.64
Allowed FAR: 7.52

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 common charges are $0 per month. Confirm the exact amount with Milton Coste before making an offer.

The current listed annual property tax is $7,128, or roughly $594 per month. Verify the current assessment with your attorney before closing.

This property has 3 bedrooms and 3 full bathrooms.

The listed interior living area is 1,944 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1899, making it approximately 127 years old.

This listing is None

Pet policy requires confirmation with Milton Coste.

At the current list price of $1,950,000 for 1,944 sq ft, the asking price per square foot is approximately $1,003. 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: RLS20122806
First Listed: 10/26/2026
On Market: 10/26/2026
Price Changed: 10/26/2026
Contract Date: 9/29/2026

Listing Courtesy of Sothebys International Realty - Michael A Cupolo

Listing Contact: (212) 431-2440

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: an agreement and a disclosure that say I work for you and negotiate on your behalf. 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 10/28/2026 at 3:05 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

25 sales last 30 days · $1.72M median · 4.2 months supply

Read Full Report

New listings in this neighborhood

Quick Facts

Status Active Type Triplex Neighborhood Park Slope Borough Brooklyn
County Kings
Floor 1 of 2
Year Built 1899
First Listed 10/26/2026
Living Area 1,944 sqft
Annual Tax $7,128

Monthly Costs Estimate

Down Payment 20%

$390,000

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 $594
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 $1M to $1,999,999 at 1.00%, applied to the whole purchase price. It is due in cash at closing and cannot be financed.

Estimated mansion tax at asking

$19,500

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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