Last updated on Nov 14, 2025

Union BK,
305 Union Avenue

Union BK is a 7-story post-war condominium in Brooklyn's Williamsburg neighborhood, completed in 2017 with 19 units. The building offers various amenities including a virtual doorman, lobby lounge, package room, bike room, exercise room, and on-site parking with electric car charging.

Recent Sales (4) $1,414 Avg. price/ft²
All Units in Building (19)

Apt. 3C

3 beds

2 baths

1,230 ft²

$1,825,000

$1,484

$1,825,000

Jun 10, 2025

Apt. 4A

2 beds

2 baths

1,209 ft²

$1,700,000

$1,406

$1,700,000

Sep 3, 2024

Apt. 3A

2 beds

2 baths

1,189 ft²

$1,764,959

$1,484

$1,749,000

Jun 10, 2024

Apt. PHA

3 beds

2 baths

1,597 ft²

$2,050,000 -8.9%

$1,284

$2,250,000

Mar 22, 2023

View Full Sales History

Overview of Union BK at 305 Union Avenue

Union BK is a post-war condominium in Brooklyn's Williamsburg neighborhood finished in 2017. Situated at 305 Union Avenue, between South 1st Street and South 2nd Street, the building contains 19 units and rises 7 stories. The building has a 421a tax abatement, and residential amenities include virtual doorman with smartphone capabilities, lobby lounge, package room with cold storage, bike room, exercise room with Fitness on Demand, and on-site parking with electric car charging capabilites.

Doorman

None

Type

Condo

Year Built

2017

Apartments

19 (view all units)

Floors

Neighborhood

Williamsburg (Brooklyn)

Min Down

20%

Developer

Michael Schlegel

Architect

Garrison Architects

Maps &
3D Aerial Views

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Amenities

Post War
Resident Storage
Rooftop Terrace
Elevator
Mail Room
Lounge
Fitness Center
On-Site Parking
Bike Room
Terraces / Balconies
Virtual Doorman

Area Map StreetView

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at Union Ave and Metropolitan Ave 0.22 miles

at Hooper and Broadway 0.22 miles

at Havemeyer and Broadway 0.35 miles

Sales History

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Sales Summary

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Editorial Coverage

Alternate Addresses

305 Union Avnue
307 Union Avenue
307-311 Union Avenue
311 Union Avenue
EcoRise Union Avenue

255 East 77th Street

between Second Avenue & Third Avenue

Lenox Hill

A masterwork by Robert A.M.Stern on the UES. Two- to six-bed condos with grand proportions and Central Park views. Selling Quickly | 2026 Occupancy.

5 beds starting at $8,150,000
6+ beds starting at $25,770,000

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RLS IDX Data display by CityRealty.com, LLC. This 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. IDX information is provided exclusively for consumers’ personal, non-commercial use and it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

All information furnished regarding property for sale, rental or financing is from sources deemed reliable, but no warranty or representation is made as to the accuracy thereof and same is submitted subject to errors, omissions, change of price, rental or other conditions, prior sale, lease or financing or withdrawal without notice. All dimensions are approximate. For exact dimensions, you must hire your own architect or engineer and for no listing shall the number of bedrooms listed be considered a legal conclusion.

All closed sales data has been provided by the New York City Department of Finance via the Automated City Register Information System (ACRIS). No warranty or representation is made as to the accuracy of any data provided by ACRIS or any other sources.

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An equal housing opportunity

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District\/BPC","_fd"],"4":[40.682676,-73.973007,"Brooklyn","_b"],"12":[40.8444,-73.9376,"Upper Manhattan","_um"],"5":[40.7477089,-73.930411,"LIC \/ Queens","_qns"],"18":[40.8889782,-73.9025,"The Bronx","_bx"]}

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Union BK,305 Union Avenue

Overview of Union BK at 305 Union Avenue

Maps &3D Aerial Views

Amenities

Sales History

Sales Summary

Pricing Comparison of Similar Buildings

Editorial Coverage

Alternate Addresses

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Union BK,
305 Union Avenue

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3D Aerial Views