331 N. Main street. Built in 1910 was originally Bonafide Manufacturing and Garage. You could have your old Ford serviced here. This was also Bonafide Manufacturing where fishing lures and frog spears were made. For years this was most known as Allison Chevrolet (bottom photo). This used to be a single story building but was heavily modified. The historical photo is of the same building circa 1912. The angled structure of the current day photo is actually a covered ramp used to drive cars up to the second floor when this was a car dealership.
The current business is very welcoming to visitors, it’s currently Plymouth Furniture Refinishing http://plymouthfurniturerefinishing.net/
PlymouthMiDiscoveries 
When the Allison Chevrolet dealership was in this building, I remember driving up the ramp to the second floor service area with my dad. It was a frightening experience for a young kid.