Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433

Under Contract – Backup offers may be accepted

121 ST MARKS Avenue
Interested in this property?
Pending For Sale Multi Family

$6,250,000

121 ST MARKS Avenue

Prospect Heights, Brooklyn

MLS® #RLS20085734

RLS at REBNY

Listing by Corcoran Group

6

Bedrooms

4.5

Baths

N/A

Sq. Ft.

1910

Year Built

Quick Summary

Bedrooms 6
Bathrooms 5 full, 2 half
Lot Size 3,092.25 sq ft
Year Built 1910
Ownership None
Property Taxes $9,924/yr
Neighborhood Prospect Heights
Floor 1 of 3

Property Highlights

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

Property Details

Type Multi Family
Ownership None
Total Rooms 8
Baths 4 Full, 2 Half
Floor 1 of 3
View Other
Cooling Central Air
Pets Yes
Year Built 1910
Structure Type Townhouse
Basement Other
Lot Size 3,092.25 sq ft
Block/Lot 01143/0068

Listing History

Event Date Price Change
Listed Apr 21, 2026 $6,250,000 -
Currently Apr 28, 2026 $6,250,000 -

Description

121 Saint Marks Avenue

On a picturesque, tree-lined block in the heart of Prospect Heights, 121 Saint Marks Avenue is a classic 21-foot-wide Brooklyn brownstone offering exceptional scale, flexibility, and opportunity.

Set on an extra-deep block, the home unfolds across approximately 4,000 square feet and is currently configured as an owner's triplex over a private one-bedroom garden apartment. Behind its handsome historic facade lies a residence defined by grand proportions, soaring ceilings, and the timeless character that makes Brooklyn townhouses so beloved.

The owner's triplex begins on the gracious parlor level, where tall windows fill the living room with natural light and original details speak to the home's historic charm. A formal dining room creates an elegant setting for entertaining, flowing naturally toward the kitchen and out to a deck overlooking the garden below. It is a floor designed equally for lively gatherings and quiet evenings at home.

Upstairs, the second and third floors offer a generous and flexible layout with multiple bedrooms and the potential for home offices, libraries, or creative spaces. The home's impressive 21-foot width allows each room to feel open and comfortable, a rarity even among Brooklyn townhouses.

Below, the garden level is configured as a one-bedroom apartment with its own entrance and direct access to the garden, ideal for rental income, guests, or conversion into a spectacular single-family residence.

The property will be delivered vacant, presenting a rare opportunity for the next owner to move right in, create a custom townhouse, or design the ideal live-plus-income configuration.

Just moments from the cafés and restaurants of Vanderbilt Avenue, the cultural energy of the Barclays Center district, and the green expanses of Prospect Park, the location offers the very best of Brooklyn living. Multiple subway lines nearby provide easy access to Manhattan and beyond.

Features & Amenities

Interior Features

Smoke Free Building Other Washer Hookup In Unit Fireplace (1)

Exterior Features

Private Outdoor Space Over60 Sqft Deck

Building Amenities

Green Building

Appliances

Washer Dryer Allowed

Building Information

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

Financial Details

RE Taxes $9,924/yr ($827/mo)

Prospect Heights is a compact Brooklyn neighborhood anchored by the Brooklyn Public Library, Grand Army Plaza, Prospect Park, and the Brooklyn Museum. The real estate market features historic brownstones, pre-war cooperatives, and new developments like Pacific Park, with 2/3/B/Q/4 train service.

Prospect Heights Live Market Data

View Neighborhood

Active Listings

30

Median Asking Price

$1.40M

Median $/Sqft

$1,446

Avg Days on Market

N/A

New This Week

2

Price Reduced

3%

Sold (30 Days)

4

Median Sale Price

$1.72M

Live data from RLS at REBNY • Updated 4/28/26, 5:29 AM EST

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Location

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121 ST MARKS Avenue, Prospect Heights, Kings County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

1872
Year Built
154 years old
3
Floors
3
Residential Units
R6B
Zoning District
Walk-Up Apartments Historic District: Prospect Heights Historic District

Tax & Assessment

Assessed Value: $212,340
Land Value: $55,080
Exemptions: $0

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

Lot Area: 3,092 SF
Building Area: 3,960 SF
Built FAR: 1.28
Allowed FAR: 2

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 $9,924, or roughly $827 per month. Verify the current assessment with your attorney before closing.

This property has 6 bedrooms and 4 full bathrooms and 2 half bathrooms.

According to MLS records, the building was constructed in 1910, making it approximately 116 years old.

This listing is None

Pets are permitted at this property. Contact the listing broker for weight limits or breed restrictions.

To schedule a private showing, contact Milton Coste at (917) 416-7433 or [email protected]. 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: RLS20085734
First Listed: 4/21/2026
On Market: 4/21/2026
Price Changed: 4/21/2026
Pending Since: 4/21/2026
Contract Date: 4/21/2026

Listing Courtesy of Corcoran Group - Jessica L Buchman

Listing Contact: (917) 579-8641

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 at REBNY

RLS Data display by Keller Williams NYC. Data last updated on 4/28/2026 at 9:29 AM UTC

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