Sims Design Group Associates LLC, often simplified as SDG Associates, is an American architectural firm, headquartered in Detroit, Michigan, U.S..
It is the city of Detroit’s oldest Black-owned architecture firm.
[1] It was founded in 1964 in Ann Arbor by architect Howard Sims, under the name Howard Sims & Associates.
[2] In 1969, the firm incorporated and Sims was given the role of president.
[3] Architect Harold Varner joined the firm in 1973.