sentences:  In 1909 plans for a new City Hall began.Mayor William A. McGee proposed selling the current offices in the Smithfield Street City Hall and the Public Safety building, and using these funds to buy the Allegheny County Courthouse and use it as the space for construction of a new City Hall.By 1912 the plans moved forward substantially with both the City of Pittsburgh and Allegheny County approving a joint venture to purchase the land and both occupy the new building.