Los Angeles — On August 9, sweetgreen, the mission-driven restaurant brand serving healthy food at scale, opened its first Michigan location in the metropolitan Detroit suburb of Birmingham. The new restaurant, which is the 170th for the brand, is located at 167 North Old Woodward Ave. The Birmingham opening will be followed by two additional Michigan restaurants — in Ann Arbor on the University of Michigan campus, and in Troy, both slated to open this fall. “When we began to explore our expansion into the Midwest, we took notice of …