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The Ex-Lax Building, 423 Atlantic Avenue - Boerum Hill, Brooklyn
The Ex-Lax Building, 423 Atlantic Avenue
Co-Op in Boerum Hill
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423 Atlantic Avenue

The Ex-Lax Building,
423 Atlantic Avenue

Co-op located in Boerum Hill, between Bond Street & Nevins Street  Map

  • Apartments For Sale (2)
  • Recent Sales (11)
  • All Units in Building (60)
Unit #
Beds
Baths
Size
Price / Ft2
Price
Listed on
Days on Market
Unit #
Beds
Baths
Size
Closing Price
Price / Ft2
Asking Price
Sold on
View Full Sales History

Overview of The Ex-Lax Building at 423 Atlantic Avenue

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.

Year Built
1928
Converted: 1981
Apartments
60
Floors
6
Neighborhood
Min Down
20%
60Apartments
View All Past
Sales & Rentals
in Building

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What Time?

9am-noon
Noon-3pm
3pm-6pm
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You can also call us anytime at
☎️ (212) 755-5544

Amenities

  • Pre War
  • Rooftop Terrace
  • Video Intercom
  • Elevator
  • Laundry Room
  • Live-In Superintendent

Shh... Many units sell without being publicly listed.

Discover hidden opportunities at The Ex-Lax Building! Reach out today to learn about select off-market listings.

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Nearby Subways

  1. G
  2. A
  3. C
at Schermerhorn 0.15 miles
  1. 2
  2. 3
  3. 4
  4. 5
at Flatbush Ave and Livingston 0.19 miles
  1. B
  2. Q
  3. R
at Flatbush Ave and Fleet 0.29 miles
  1. D
  2. N
at 4th Ave and Pacific 0.32 miles
  1. F
at Smith 0.39 miles

Nearby Schools

  1. Ps 369 Coy L Cox School
    Grades: KG,1,2,3,4,5,6,7,8,9,10,11,12,UG
  2. Ps 38 The Pacific
    Grades: PK,KG,1,2,3,4,5
  3. Khalil Gibran International Academy
    Grades: 9,10,11,12
  4. Zipporiah Mills
    Grades: PK,KG,1,2,3,4,5
  5. Brooklyn High School of the Arts
    Grades: 9,10,11,12
Data courtesy of GreatSchools.org
  1. Hanover Place Child Care
    Grades: PK,KG
  2. The Sterling School
    Grades: 3,4,5,6
  3. Science, Language & Arts International School
    Grades: PK,KG,1,2,3,4,5
  4. Science Language & Arts
    Grades: PK,TK,KG,1,2,3,4,5
  5. Muse Academy
    Grades: PK,TK,KG,1
Data courtesy of GreatSchools.org
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The Ex-Lax Building, 423 Atlantic Avenue Floorplans

Apt 3NP
2 beds, 2 baths, Approx. 1,854 ft2
Apt 4N
1 bed, 1 bath, Approx. ft2
Apt 4M
2 beds, 2 baths, Approx. ft2
Last sold for $1,835,000
on Jan 10, 2023
View Unit History
Apt 3C
2 beds, 1 bath, Approx. ft2
Last sold for $1,280,000
on Feb 3, 2022
View Unit History
Apt 2N
1 bed, 1 bath, Approx. 925 ft2
Last sold for $999,999
on Oct 27, 2021
View Unit History
Apt 5C
2 beds, 1 bath, Approx. ft2
Last sold for $1,550,000
on May 14, 2021
View Unit History
View All Floorplans

Sales History

Price/Room (Est)

Why are we displaying the estimated price per room?

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.

Price/Ft2 (Est)
View Full Closing History
Created with Highstock 5.0.0SalesPrice Per Sq. Ft.200320042005200620072008200920102011201220132014201520162017201820192020202120222023202420250246810$200$400$600$800$1,000$1,200Please note that price/ft2 calculations is from only 65% of total transactions during the period
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
Year
Avg Price / Room (Est) Avg. Actual Price Med. Actual Price
Transactions
2025
-
-
0
2024
-
-
0
2023
$352,875
$1,595,000
2
2022
$322,250
$1,287,500
4
2021
$329,167
$1,276,667
6
2020
$400,000
$1,600,000
1
2019
$357,800
$1,276,250
5
2018
$312,500
$1,250,000
1
2017
$283,729
$1,298,600
5
2016
$248,750
$865,000
2
2015
$300,000
$1,408,333
3
2014
$383,212
$1,149,635
2
Year
Avg Price / Room (Est) Avg. Actual Price Med. Actual Price
Transactions
2013
$220,865
$852,500
6
2012
$215,590
$971,857
7
2011
$176,457
$859,583
6
2010
$309,667
$819,000
2
2009
$200,000
$1,200,000
1
2008
$233,333
$700,000
1
2007
$227,143
$856,100
5
2006
$175,313
$793,500
4
2005
$175,583
$758,000
3
2004
$131,896
$451,125
4
2003
$121,771
$391,250
4

Sales History by Apartment Size

View Full Closing History
Show:
Created with Highstock 5.0.0Price/Ft²20042005200620072008200920102011201220132014201520162017201820192020202120222023$0$250$500$750$1,000

Pricing Comparison of Similar Buildings

View Detailed Comparison
Average Price per Sq. Ft.
$459,000
-
$413,100
-
$367,200
-
$321,300
-
$275,400
-
$229,500
-
$183,600
-
$137,700
-
$91,800
-
$45,900
-
$0
-
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Editorial Coverage

Alternate Addresses

  • 417 Atlantic Avenue
  • 419 Atlantic Avenue
  • 421 Atlantic Avenue
  • 423-443 Atlantic Avenue
  • 425 Atlantic Avenue
  • 427 Atlantic Avenue

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