The building of the original Georgia Dome cost $158,000,000

The Dome covers 32 acres and has 72,000 seats. Although the majority of the Dome was built on abandoned railroad land, 126 homes in the Lightning neighborhood were torn down to make room for it.

Source:
Galloway, Jim. The Atlanta Journal-Constitution, November 1, 1987, Section 15C.
The location in the Kenan Research Center (Atlanta History Center) can be found here.