3 , ▁I . M . ▁Pe i ▁& ▁Part ners ▁announced ▁that ▁all ▁ 1 0 , 3 4 4 ▁window ▁pan es ▁would ▁each ▁be ▁replaced ▁by ▁single - pan ed , ▁heat - tre ated ▁pan els ▁at ▁a ▁total ▁cost ▁between ▁$ 5 ▁million ▁and ▁$ 7 ▁million . ▁Appro xim ately ▁ 5 , 0 0 0 ▁of ▁the ▁original ▁glass ▁pan es ▁were ▁removed ▁int act , ▁and ▁were ▁later ▁offered ▁for ▁re - use ▁by ▁artists . ▁ ▁During ▁the ▁many ▁months ▁it ▁took ▁to ▁diagn ose ▁and ▁repair ▁the ▁building , ▁sheets ▁of ▁p lywood ▁replaced ▁many ▁of ▁the ▁missing ▁glass ▁windows ▁of ▁the ▁building , ▁ear ning ▁it ▁the ▁nick names ▁" P lywood ▁Palace " ▁and ▁" P lywood ▁R anch " ▁( the ▁same ▁name ▁as ▁a ▁local ▁l umber ▁yard ▁chain ▁at ▁the ▁time ). ▁B ost oni ans ▁j oked ▁that ▁the ▁Han cock ▁Tower ▁was ▁" the ▁world ' s ▁tall est ▁p lywood ▁building ". ▁ ▁The ▁building ' s ▁upper - floor ▁occup ants ▁suffered ▁from ▁motion ▁sick ness ▁when ▁the ▁building ▁s way ed ▁in ▁the ▁wind . ▁To ▁reduce ▁the ▁movement , ▁contract ors ▁installed ▁a ▁tun ed ▁mass ▁dam per ▁on ▁the ▁ 5 8 th ▁floor . ▁As ▁described ▁by ▁Robert ▁Campbell , ▁architecture ▁critic ▁for ▁The ▁Boston ▁Glo be : ▁ ▁Two ▁ 3 0 0 - ton ▁weights ▁sit ▁at ▁opposite ▁ends ▁of ▁the ▁ 5 8 th ▁floor ▁of ▁the