Flat Grove was built in the 1770's by Jacob Smith of hand-hewn, heart-pine logs covered with clapboard. Alamo hero James Butler Bonham, son of James and Sophia Smith Bonham and grandson of Jacob Smith, was born in 1807 in the house, which is today the only extant birthplace of an Alamo hero. The two-story, four-room structure was originally a dogtrot house with an open hall, which was later closed in when two rooms were added downstairs. Originally the kitchen was separate from the house but in the late 1800's, a kitchen was added behind the dining room.