: Univers ity ▁of ▁Illinois ▁al umn i ▁Category : American ▁women ▁histor ians ▁Category : 2 1 st - century ▁American ▁women ▁writers <0x0A> </s> ▁The ▁Pitts burgh ▁City - Count y ▁Building ▁is ▁the ▁seat ▁of ▁government ▁for ▁the ▁City ▁of ▁Pitts burgh , ▁and ▁houses ▁both ▁Pitts burgh ▁and ▁Al leg hen y ▁County ▁offices . ▁It ▁is ▁located ▁in ▁Dow nt own ▁Pitts burgh ▁at ▁ 4 1 4 ▁Grant ▁Street , ▁Pitts burgh , ▁Pennsylvania . ▁Bu ilt ▁from ▁ 1 9 1 5 - 1 7 ▁it ▁is ▁the ▁third ▁seat ▁of ▁government ▁of ▁Pitts burgh . ▁Today ▁the ▁building ▁is ▁occupied ▁mostly ▁by ▁Pitts burgh ▁offices ▁with ▁Al leg hen y ▁County ▁located ▁in ▁adjacent ▁county ▁facilities . ▁ ▁It ▁also ▁contains ▁a ▁court room ▁for ▁the ▁Supreme ▁Court ▁of ▁Pennsylvania ▁when ▁holding ▁sessions ▁in ▁Pitts burgh . ▁ ▁History ▁At ▁the ▁start ▁of ▁the ▁ 2 0 th ▁century , ▁City ▁of ▁Pitts burgh ▁and ▁Al leg hen y ▁County ▁officials ▁began ▁to ▁realize ▁that ▁the ▁current ▁structure ▁which ▁hous ed ▁the ▁city ▁and ▁county ▁government ▁offices ▁was ▁ins u fficient ▁for ▁the ▁city ' s ▁rapid ▁growth . ▁The ▁offices ▁at ▁that ▁time ▁were ▁located ▁in ▁the ▁Smith field ▁Street ▁City ▁Hall ▁building , ▁which ▁was ▁built ▁in ▁ 1 8 6 8 - 1 8 7 2 . ▁The ▁demand ▁for ▁new ▁offices ▁grew ▁expon entially ▁with ▁the ▁incorpor ation ▁of ▁Al leg hen y ▁City ▁into ▁the ▁City ▁of ▁Pitts burgh ▁in