versary ▁of ▁incorpor ation ▁was ▁held ▁in ▁Pitts burgh ▁and ▁a ▁para de ▁w ound ▁through ▁dow nt own ▁Pitts burgh ▁ending ▁at ▁a ▁steel - framework ▁of ▁what ▁would ▁become ▁the ▁new ▁City - C oun cil ▁Building . ▁Three ▁corner st ones ▁were ▁laid ▁during ▁the ▁celebr ation , ▁including ▁one ▁for ▁the ▁City , ▁one ▁for ▁the ▁County , ▁and ▁one ▁for ▁the ▁workers , ▁each ▁of ▁which ▁contained ▁time ▁caps ules . ▁The ▁construction ▁on ▁the ▁new ▁building ▁finished ▁in ▁ 1 9 1 7 , ▁and ▁was ▁completed ▁under ▁budget . ▁In ▁April ▁ 1 9 1 7 , ▁the ▁City ▁Law ▁Department ▁was ▁the ▁first ▁to ▁switch ▁into ▁the ▁new ▁building , ▁with ▁the ▁rest ▁of ▁the ▁remaining ▁offices ▁allocated ▁by ▁June . ▁The ▁building ▁was ▁nominated ▁in ▁January ▁ 2 0 1 6 ▁to ▁become ▁a ▁City ▁Historic ▁Site ▁by ▁Pres ervation ▁Pitts burgh . ▁ ▁Architecture ▁ ▁In ▁ 1 9 1 4 , ▁a ▁competition ▁was ▁held ▁for ▁a ▁new ▁Pitts burgh ▁City ▁Hall . ▁The ▁ 1 6 - entry ▁competition ▁led ▁to ▁the ▁commission ing ▁of ▁Edward ▁B . ▁Lee , ▁a ▁respect ed ▁Pitts burgh ▁architect , ▁with ▁Pal mer , ▁Horn b ost el , ▁& ▁Jones ▁as ▁associated ▁architect s . ▁The ▁completed ▁design ▁was ▁done ▁by ▁Henry ▁Horn b ost el . ▁▁ ▁The ▁building ▁was ▁designed ▁in ▁the ▁Be aux ▁Arts ▁style , ▁with ▁elements ▁of ▁the ▁City ▁Beautiful ▁Mov ement . ▁The ▁City - Count y