▁and ▁the ▁reconst ruction ▁of ▁the ▁K and in sky - K lee ▁house ▁in ▁D ess au ; ▁both ▁World ▁Heritage ▁S ites . ▁During ▁World ▁War ▁II ▁it ▁deployed ▁forced ▁labor ▁on ▁construction ▁projects . ▁It ▁built ▁the ▁F ühr erb unker ▁in ▁Berlin , ▁the ▁scene ▁of ▁Adolf ▁Hitler ' s ▁suic ide , ▁as ▁well ▁as ▁Hitler ' s ▁home ▁in ▁Berg hof ▁and ▁the ▁Wolf s sch anze ▁headquarters . ▁More ▁recent ▁constru ctions ▁have ▁included ▁Bos ph orus ▁Bridge ▁( T ur key ), ▁King ▁Abd ul az iz ▁International ▁Airport ▁( Sa udi ▁Arab ia ), ▁and ▁the ▁Mess et urm ▁and ▁Com mer z bank ▁Tower ▁in ▁Frankfurt . ▁ ▁In ▁late ▁ 2 0 1 0 , ▁Spanish ▁construction ▁company ▁Gru po ▁A CS , ▁which ▁already ▁owned ▁a ▁ 3 0 ▁percent ▁st ake ▁of ▁Ho cht ief , ▁launched ▁a ▁bid ▁that ▁would ▁allow ▁A CS ▁to ▁ac quire ▁an ▁additional ▁ 2 0 ▁percent ▁st ake ▁of ▁Ho cht ief . ▁The ▁bid ▁was ▁approved ▁by ▁the ▁German ▁Federal ▁Fin an cial ▁Super vis ory ▁Author ity ▁( B a Fin ) ▁on ▁ 2 9 ▁November ▁ 2 0 1 0 . ▁A CS ▁increased ▁its ▁st ake ▁in ▁Ho cht ief ▁to ▁ 5 0 . 1 6 ▁percent ▁in ▁June ▁ 2 0 1 1 , ▁effectively ▁taking ▁over ▁control ▁of ▁Ho cht ief . ▁ ▁History ▁ ▁Early ▁years ▁The ▁company ▁was ▁probably ▁founded ▁in ▁ 1