He designed many buildings in Davidson County, Tennessee, especially Nashville and Belle Meade, some of which are listed on the National Register of Historic Places.
[4] Southgate designed the Thigpen Building at 3608 West End Avenue in 1918 for John J. Bevington, a world War I veteran and the vice president of Cain-Sloan.
[6] He designed the Thomas P. Kennedy Jr. House in Forest Hills, Tennessee, in 1937; it is listed on the National Register of Historic Places.
[2] He designed the Joseph B. Knowles Memorial Home for Aged Colored Persons, built by the Public Works Administration in 1935.
[11] His funeral was held at St. George's Episcopal Church, and he was buried in Mount Olivet Cemetery.
[1] The Southgate Condominiums, an apartment building on West End Avenue, was named in his honor.