Columbia City Hall (South Carolina)
The Columbia City Hall, in Columbia, South Carolina, also known as Old United States Court House and Post Office, was built in 1870 at a cost of $400,000 (approximately $13,200,000 in 2025). It served as a federal courthouse from 1874 to 1936 when it was re-purposed to serve as the city hall.
Source: Wikipedia — Columbia City Hall (South Carolina) (CC BY-SA 4.0)