The Ex-Lax Building, originally constructed in 1925 and converted to residential use in 1981, is a well-established cooperative offering a variety of amenities. These include a central laundry room, an on-site superintendent, video security, a virtual doorman, and a beautifully landscaped rooftop terrace with stunning 360-degree panoramic views.
Located at 423 Atlantic Avenue in Brooklyn's Boerum Hill neighborhood, this prewar co-op was completed in 1928. The six-story, 60-unit building sits between Bond Street and Nevins Street and features an elevator and video intercom for added convenience.
Residents enjoy close proximity to shops, diverse restaurants, and cultural landmarks like BAM and the Barclays Center. The building is also ideally located near major subway lines (A/B/C/D/F/G/N/Q/R/2/3/4/5) and the LIRR.
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For some co-ops, instead of price per square foot, we use an estimate of the number of rooms for each sold apartment to chart price changes over time. This is because many co-op listings do not include square footage information, and this makes it challenging to calculate accurate square-foot averages.
By displaying the price per estimated room count, we are able to provide a more reliable and consistent metric for comparing sales in the building. While we hope that this gives you a clearer sense of price trends in the building, all data should be independently verified. All data provided are only estimates and should not be used to make any purchase or sale decision.
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Year
Avg Price / Ft2 (Est)
Median Price / Ft2 (Est)
Avg. Actual Price
Med. Actual Price
Transactions
2025
-
-
-
-
0
2024
-
-
-
-
0
2023
$903
$1,595,000
$903
$1,595,000
2
2022
$1,045
$1,287,500
$1,045
$1,312,500
4
2021
$1,036
$1,276,667
$1,042
$1,225,000
6
2020
$889
$1,600,000
$889
$1,600,000
1
2019
$884
$1,276,250
$850
$1,256,250
5
2018
$962
$1,250,000
$962
$1,250,000
1
2017
$936
$1,298,600
$936
$940,000
5
2016
$843
$865,000
$843
$865,000
2
2015
$966
$1,408,333
$966
$1,250,000
3
2014
$923
$1,149,635
$923
$1,149,635
2
|
Year
Avg Price / Ft2 (Est)
Median Price / Ft2 (Est)
Avg. Actual Price
Med. Actual Price
Transactions
2013
$647
$852,500
$647
$780,000
6
2012
$695
$971,857
$687
$940,000
7
2011
$574
$859,583
$616
$850,500
6
2010
$583
$819,000
$583
$819,000
2
2009
$706
$1,200,000
$706
$1,200,000
1
2008
$737
$700,000
$737
$700,000
1
2007
$588
$856,100
$576
$800,000
5
2006
$598
$793,500
$595
$794,500
4
2005
$654
$758,000
$647
$599,000
3
2004
$384
$451,125
$384
$458,750
4
2003
$353
$391,250
$352
$387,500
4
Please note that price/ft2 calculations is from only 65% of total transactions during the period
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