I happened upon this building by chance when I was visiting the Old Michigan City Lighthouse. It is a one story brick New York Central Craftsmen Style Building at 100 Washington Street. It was built for the Michigan Central Rairoad in 1905. I do not know when it ceased being used as a train station.
Apparently over the years, it was used by multiple restaurants. Some of these were Swingbellys, 100 Washington and Arcadia. Currently, it appears vacant. There appears to be a homeless encampment adjacent to the building.
There is a concrete platform and three sided shelter adjacent to the railroad tracks in this area. For forty years, these were used by Amtrak. This service was discontinued in 2022.