Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
670 Union Street #4A
Active For Sale Condo

$3,850,000

$1,886 per sq ft

670 Union Street #4A

Park Slope, Brooklyn

MLS® #RLS20065084

RLS at REBNY

Listing by Compass

3

Bedrooms

4.5

Baths

2,041

Sq. Ft.

2022

Year Built

Quick Summary

Bedrooms 3
Bathrooms 4 full, 1 half
Living Area 2,041 sq ft
Year Built 2022
Ownership Condo
HOA/Common Charges $945/mo
Property Taxes $25,680/yr
Parking Garage
Neighborhood Park Slope
Floor 4 of 6

Property Highlights

  • Exposure: East facing
  • Outdoor Space: Deck, Balcony
  • Climate Control: Central Air

Property Details

Type Condo
Ownership Condominium
Total Rooms 6
Baths 3 Full, 1 Half
Floor 4 of 6
Exposure East
Heating Central
Cooling Central Air
Pets Yes, CatsOk, DogsOk
Year Built 2022
Living Area 2,041 sq ft
Parking Garage Available
Parking Features Garage, On Site
Structure Type Duplex
Flooring Hardwood, Tile
Furnished Unfurnished
Parcel # 00955-1208
Block/Lot 00955/1208

Description

Timber House introduces a new standard for Brooklyn condominium living, where sustainability, design, and comfort intersect. Crafted using cutting-edge timber construction and thoughtfully layered natural materials, this newly completed three-bedroom, three-and-a-half-bath home offers a modern retreat with an elevated, architectural presence. With 2,041 square feet of interior space, the home is defined by soaring nearly 11-foot ceilings, exposed beams, and wide-plank engineered pine floors by Roots Custom. The open living area is both expansive and adaptable, easily accommodating formal dining, relaxed entertaining, and work-from-home needs. At its center, a refined European kitchen pairs custom cabinetry and porcelain countertops with hexagonal tile flooring by Prospect NY, a walk-in pantry, and a curated suite of Bosch and Gaggenau appliances, including an induction cooktop. The primary suite is a private sanctuary featuring a generous walk-in closet and a spa-inspired Carrara marble bath with a Duravit soaking tub, oversized walk-in shower with linear drain, Restoration Hardware medicine cabinets, and a custom floating vanity finished with Brizo brushed gold fixtures. Two additional bedroom suites each include their own bathrooms, one enhanced by a Juliet balcony and walk-in closet. A powder room, in-unit Miele washer-dryer, and integrated smart home technology—including Lutron lighting, Latch entry, Nest safety systems, and high-speed connectivity—complete the residence. A private storage unit and dedicated on-site parking space with EV charging are included in the purchase price, offering rare convenience in this sought-after neighborhood. Timber House’s striking Danish brick exterior conceals an advanced glue-laminated timber structural system that minimizes environmental impact while maximizing strength and warmth. Energy-conscious features such as triple-glazed Passive House-quality windows, solar panels, multi-zone heat pump heating and cooling, energy-recovery ventilation, and mineral wool insulation create a quiet, efficient, and comfortable living environment. Residents enjoy a modern lobby with secure package storage, bike storage, private storage for each residence, and a beautifully landscaped, furnished roof deck with panoramic views stretching across Brooklyn and Manhattan. Timber House offers a rare opportunity to own a design-driven, environmentally responsible home in one of Brooklyn’s most dynamic and desirable settings.

Features & Amenities

Interior Features

Entrance Foyer Eat In Kitchen High Ceilings Pantry Soaking Tub Walk In Closets In Unit See Remarks Flooring: Hardwood, Tile

Exterior Features

Balcony Juliet Balcony Private Outdoor Space Under60 Sqft Deck Balcony

Building Amenities

Elevators

Appliances

Cooktop Dryer Dishwasher Washer

Building Information

Total Units 14
Stories 6
Structure Duplex

Financial Details

Common Charges $945/mo
RE Taxes $25,680/yr ($2,140/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

67

Median Asking Price

$1.79M

Median $/Sqft

$1,374

Avg Days on Market

N/A

New This Week

2

Price Reduced

18%

Sold (30 Days)

22

Median Sale Price

$1.60M

Live data from RLS at REBNY • Updated 2/16/26, 3:20 AM EST

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Location

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670 Union Street #4A, Park Slope, Kings County

MLS® ID: RLS20065084
First Listed: 1/5/2026
On Market: 1/5/2026
Price Changed: 1/5/2026
Contract Date: 1/1/2026

Listing Courtesy of Compass - Roland J Augustine

Listing Contact: (917) 846-6297

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.

RLS at REBNY

RLS Data display by Keller Williams NYC. Data last updated on 2/16/2026 at 8:20 AM UTC

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