[3] A second structure, named Luther Hall, was built adjacent to the main building in 1940 to provide additional meeting and activity space.

Since 1998, the sanctuary has housed the THC's library, while Luther Hall provides office space for the commission's History Programs Division.

[4] The Gethsemane Lutheran Church sanctuary building is a rectangular two-story hall constructed of tan brick atop a limestone foundation and basement, with a gray pressed tin roof.

[3] The sanctuary building has a rectangular plan oriented east-to-west, with the main facade and tower on the east and an apse on the west.

The main entrance, located at the base of the projecting steeple, features a Gothic arch with a stained-glass transom window above paneled wood double doors.

[4] Luther Hall is a two-story rectangular building constructed of brick and limestone on a concrete foundation, situated immediately to the west of the sanctuary.