He designed many buildings in Los Angeles County, California, including Beverly Hills and Bel Air.
With architect Harry G. Koerner (c. 1881 - 1935), Gage designed private residences and government buildings in Beverly Hills.
[2] In 1931, they designed the Beverly Hills City Hall in the Spanish Colonial Revival style, and the two men attended its dedication in April 1932.
[4] He designed a Neocolonial house in Beverly Hills in 1938; it belonged to actress Donna Reed.
[5] He also designed the Shepherd Residence in the Neoclassical and Regency styles in Bel Air in 1938.