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Buildings·The Ex-Lax Building·Sold prices

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423 Atlantic Avenue (The Ex-Lax Building)Recorded sales & closing prices

423 Atlantic Avenue, Brooklyn, NY 11217

84 recorded transfers, 1997–2026. Sortable and searchable below.

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Co-ops are normally measured by price per room, since square footage is not officially recorded for them. This building is shown in price per square foot because most of its sales carry documented footage, which makes the sharper measure the honest one here.

Recorded transfers
84
Date range
1997–2026
Median $/sf
$1,483
2025 · latest with sq ft · 1 sales
Listing discount
0.0%
median, from last ask
Monthly carry/sf
$1.56
≈ $2,032/mo · recent
Price range
$499K – $2.75M
Price shift · median $/sf · floor-adjusted
Since 2005
▲ +86.1%
10-Year
▲ +15.7%
Since 2022
▲ +4.5%
1-Year
▲ +0%

Change in the building’s median $/sf over each window, on a floor-adjusted basis — standardized to the building’s average floor, so it reflects price rather than which floors happened to sell. This is a different method from The Roebling Index, which publishes plain medians and applies no floor adjustment; the two are not interchangeable. Floor adjustment standardizes for floor only. It does not control for condition, size, exposure, renovation or the mix of what happened to trade. (2022 marks the rate-shock inflection.) Like-for-like repeat-sale figures to follow.

The complete recorded-sale history for The Ex-Lax Building, compiled from NYC Department of Finance transfer records, with apartment-by-apartment detail from The Roebling Research Library.

Price per square foot over time

35 sales with a known square footage, by closing date.

$434$988$1,542'05'09'13'17'21'253J · $599/sf · 20052L · $569/sf · 20063F · $621/sf · 20064C · $493/sf · 20073D · $576/sf · 20073A · $562/sf · 20074D · $641/sf · 20075D · $625/sf · 2007$724/sf · 20084F · $737/sf · 20082M · $706/sf · 20092J · $583/sf · 20102M · $735/sf · 20112L · $664/sf · 20113D · $616/sf · 20112E · $609/sf · 20112AB · $687/sf · 20122D · $662/sf · 20125D · $1,016/sf · 20142C · $970/sf · 20153E · $962/sf · 20152N · $843/sf · 20164P · $1,003/sf · 20161B · $836/sf · 20195D · $1,057/sf · 20204L · $889/sf · 20203B · $993/sf · 20205C · $1,312/sf · 20213J · $984/sf · 20214K · $899/sf · 20211L · $1,042/sf · 20214E · $985/sf · 20223K · $917/sf · 20225D · $1,253/sf · 20223NP · $1,483/sf · 2025
Each dot is one recorded sale with a known interior square footage, plotted by closing date against price per square foot. The line is the median $/sf each year, adjusted to a floor-standardized (average-floor) unit — so it reflects price movement, not which floors happened to sell that year. Individual sale prices in the table below are unadjusted — and you can click any dot to jump straight to that sale.

Recent closings

The building’s 10 most recent market sales.

DateUnitApartmentPrice$/sfvs. Ask
Sep 23, 20263H1 BA$977,000+5.6%
Sep 16, 20253C2 BR · 1 BA$1,510,000+7.9%
Jun 25, 20253NP2 BR · 2 BA · 1,854 sf$2,750,000$1,483+0.0%
Jun 24, 20254N1 BR · 1 BA$1,085,000-5.7%
Jan 10, 20234M2 BR · 2 BA$1,835,000-0.8%
Jul 20, 20224A2 BR · 2 BA$1,700,000+13.7%
Jun 6, 20225D2 BR · 1 BA · 1,277 sf$1,600,000$1,253+14.7%
May 16, 20223K1 BR · 1 BA · 900 sf$825,000$917+3.8%
Feb 15, 20224E2 BR · 2 BA · 1,365 sf$1,345,000$985+0.0%
Feb 3, 20223C2 BR · 1 BA$1,280,000-8.2%

The retrade record

Lines that have changed hands more than once in the public record — the building’s appreciation arc, apartment by apartment.

2J+75%
$538,000 ($583/sf) 2010 → $940,000 2017
4C+73%
$739,000 ($493/sf) 2007 → $1,275,000 2019
3J · 940 sf+54%
$599,000 ($599/sf) 2005 → $925,000 ($984/sf) 2021
5C · 1,181 sf+50%
$1,035,000 2012 → $1,550,000 ($1,312/sf) 2021
4E · 1,365 sf+49%
$900,000 2011 → $1,345,000 ($985/sf) 2022
2N+28%
$780,000 ($843/sf) 2016 → $999,999 2021
1D+26%
$575,000 2005 → $725,000 2017
2L · 1,800 sf+20%
$995,000 ($569/sf) 2006 → $1,195,000 ($664/sf) 2011
3C+18%
$1,280,000 2022 → $1,510,000 2025
3F+15%
$590,000 ($621/sf) 2006 → $680,000 2012
3D · 1,300 sf+7%
$749,000 ($576/sf) 2007 → $801,000 ($616/sf) 2011
2M · 1,700 sf+4%
$1,200,000 ($706/sf) 2009 → $1,250,000 ($735/sf) 2011
4M+3%
$1,780,000 2017 → $1,835,000 2023

Every recorded sale

Sort any column; filter by unit or keyword. Prices are the recorded transfer amount at the NYC Department of Finance. Every sale sits in one of three states: counted in the building’s medians and trend; shown but excluded as a non-arms-length or nominal transfer; or shown and ⚑ flagged for review — a possible duplicate filing or an extreme $/sf outlier, held out of the statistics pending manual verification rather than allowed to move them.

84 recorded sales
Apartment
Sep 23, 20263H1 BA—$977,000—+5.6%
Sep 16, 20253C2 BR · 1 BA—$1,510,000—+7.9%
Jun 25, 20253NP2 BR · 2 BA1,854$2,750,000$1,483+0.0%
Jun 24, 20254N1 BR · 1 BA—$1,085,000—-5.7%
May 23, 20234C2 BR · 1 BAoutside the market statistics (eligibility screen)—$1,355,000——
Jan 10, 20234M2 BR · 2 BA—$1,835,000—-0.8%
Jul 20, 20224A2 BR · 2 BA—$1,700,000—+13.7%
Jun 6, 20225D2 BR · 1 BA1,277$1,600,000$1,253+14.7%
May 16, 20223K1 BR · 1 BA900$825,000$917+3.8%
Apr 27, 20222E2 BR · 2 BAoutside the market statistics (eligibility screen)1,300$1,325,000$1,019—
Feb 15, 20224E2 BR · 2 BA1,365$1,345,000$985+0.0%
Feb 3, 20223C2 BR · 1 BA—$1,280,000—-8.2%
Dec 10, 20213H1 BAoutside the market statistics (eligibility screen)—$860,000——
Nov 17, 20211L2 BR · 1.5 BA1,800$1,875,000$1,042-1.1%
Oct 27, 20212N1 BR · 1 BA—$999,999—+0.5%
Sep 2, 20214K1 BR1,000$899,000$899+0.0%
Aug 9, 20213J1 BR · 1 BA940$925,000$984+8.8%
Jun 8, 20212D2 BRnon-market transfer (excluded from $/sf & trends)1,200$200,000——
May 14, 20215C2 BR · 1 BA1,181$1,550,000$1,312-2.8%
Jan 11, 20211A3 BR · 2 BA—$1,450,000—-7.9%
May 7, 20203B1 BR · 1 BA1,006$999,000$993-9.2%
Apr 16, 20204L1 BR · 2 BA1,800$1,600,000$889-19.8%
Mar 17, 20205D2 BR · 1 BA1,277$1,350,000$1,057-6.9%
Nov 22, 20193D2 BRoutside the market statistics (eligibility screen)1,300$1,256,250$966—
Nov 15, 20194C2 BR · 1 BA—$1,275,000—-5.6%
Aug 8, 20194N2 BR · 1 BA—$970,000—-1.9%
Jun 27, 20191B2 BR · 1 BA1,400$1,170,000$836-21.7%
Jan 23, 20195E2 BR—$1,710,000—+2.1%
May 24, 20182E2 BR · 2 BAoutside the market statistics (eligibility screen)1,300$1,250,000$962—
Jun 28, 20171D1 BR—$725,000—+0.0%
Jun 8, 20176ABoutside the market statistics (eligibility screen)—$2,195,000——
May 16, 20172K1 BR · 1 BA—$853,000—+7.3%
Mar 2, 20172J1 BR—$940,000—+4.4%
Feb 13, 20174M2 BR · 2 BA—$1,780,000—+5.0%
Sep 22, 20164P2 BR · 1 BA947$950,000$1,003-4.5%
Jan 28, 20162N1 BR925$780,000$843-7.7%
Aug 26, 20154JH3 BR—$1,825,000—+1.4%
Jul 13, 20153E2 BR · 1 BA1,300$1,250,000$962+0.0%
Jun 9, 20152C2 BR1,186$1,150,000$970-3.0%
Dec 18, 20146Doutside the market statistics (eligibility screen)—$999,000——
Oct 24, 20145D2 BR1,280$1,300,270$1,016+13.1%
Aug 6, 20134N2 BR—$810,000—+5.3%
May 13, 20132P1 BR—$680,000—-8.0%
Mar 29, 20133Goutside the market statistics (eligibility screen)—$900,000——
Mar 6, 20131E3 BR—$1,250,000—-12.3%
Mar 1, 20133N2 BR—$750,000—-1.3%
Mar 1, 20133P2 BR—$725,000—+0.0%
Nov 28, 20123F2 BR—$680,000—+0.7%
Oct 26, 20122D2 BR1,200$794,000$662-0.6%
Jul 23, 20122AB3 BR2,475$1,700,000$687-5.3%
Jul 9, 20124P2 BR · 1 BAoutside the market statistics (eligibility screen)947$655,000$692—
Jun 7, 20124A2 BR · 2 BAoutside the market statistics (eligibility screen)—$940,000——
May 22, 20124G2 BRoutside the market statistics (eligibility screen)—$999,000——
Apr 2, 20125C2 BR—$1,035,000—-3.7%
Sep 7, 20112E2 BR · 2 BA1,300$791,500$609-0.9%
May 16, 20113K1 BR · 1 BAnon-market transfer (excluded from $/sf & trends)900$220,000——
Apr 14, 20114E2 BR—$900,000—+0.0%
Apr 12, 20113D2 BR1,300$801,000$616-2.9%
Mar 15, 20112L2 BR1,800$1,195,000$664-4.4%
Mar 11, 20112M3 BR1,700$1,250,000$735-7.4%
Dec 3, 20105E2 BRoutside the market statistics (eligibility screen)—$1,100,000——
Jul 6, 20102J1 BR923$538,000$583-3.8%
Oct 28, 20092M3 BR1,700$1,200,000$706-4.0%
Oct 22, 20084F1 BR950$700,000$737+0.0%
Jan 27, 2008—3 BR1,650$1,195,000$724+0.0%
Oct 15, 20075D1 BR1,280$800,000$625+0.1%
Jul 17, 20071A3 BR · 2 BAoutside the market statistics (eligibility screen)—$1,147,500——
Jun 22, 20074D1 BR1,200$769,000$641+0.0%
Apr 30, 20073A1 BR1,450$815,000$562+2.5%
Apr 4, 20073D2 BR1,300$749,000$576+0.0%
Mar 18, 20074C2 BR1,500$739,000$493+0.0%
Jul 6, 20064G2 BRoutside the market statistics (eligibility screen)—$850,000——
Jun 14, 20062E2 BR · 2 BAoutside the market statistics (eligibility screen)1,300$739,000$568—
Mar 22, 20063F2 BR · 1 BA950$590,000$621+2.6%
Mar 21, 20064G2 BR—$499,000—ask unverified
Jan 24, 20062L2 BR1,750$995,000$569+11.2%
Nov 2, 20052M3 BRoutside the market statistics (eligibility screen)1,700$1,100,000$647—
Oct 25, 20053J1 BR1,000$599,000$599+0.0%
Aug 19, 20051D1 BR—$575,000—+0.0%
Dec 29, 20044D1 BRoutside the market statistics (eligibility screen)1,200$455,000$379—
Dec 20, 20044F1 BRoutside the market statistics (eligibility screen)950$462,500$487—
Sep 16, 20042C2 BRoutside the market statistics (eligibility screen)1,186$465,000$392—
Jun 9, 20044C2 BRnon-market transfer (excluded from $/sf & trends)1,500$422,000——
Jul 28, 19974D2 BR · 1 BAnon-market transfer (excluded from $/sf & trends)—$148,000——
Sources, exclusions and how these figures are computed

Sales sourced from NYC Department of Finance recorded transfers (BBL 3-00178-0054). Apartment-level facts (line, condition, asking-price context) curated and cross-verified in The Roebling Research Library. Not all transactions cross-verify with ACRIS records — sponsor and LLC purchases sometimes record at stipulated values rather than market price; square footage on co-ops is not officially recorded, figures shown are approximate. Storage, parking, and commercial units are excluded from all figures. Floor- and line-level $/sf are time-controlled (each sale measured against the building’s going rate at the time of sale) and expressed at today’s pricing, so they isolate the floor or line premium rather than blend two decades of market movement.

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