|Image snipped from box of Vollmer 45612|
Frankly, its look doesn't say Workshop to me. It says things like bank, library, accountancy, or post office. Removing the peaked ends to convert it to a flat roofed building, and getting rid of the roof-top stuff as well as the decorative insignias, it could reside on the OPL.
These Machine Shop like buildings are no doubt a common building type in the world of HO architecture.