The construction of the building .
It has served a number of purposes including United States Post Office ( 1842 -- 1862 ) and , during the American Civil War , Confederate post office ( 1862 -- 1865 ) .
Since the construction of the building , it has served a number of purposes including United States Post Office ( 1842 -- 1862 ) and , during the American Civil War , Confederate post office ( 1862 -- 1865 ) .