What to look for in mixed commercial/residential building?

[John Franczyk]

I'm in the early stages of looking for a building in Milwaukee that has light manufacturing/fabricating space (about 800 sq.ft.) for a woodworking shop, and 3-4 residential units. What issues do I need to consider for a mixed commercial/residential building that I wouldn't need to look at for something purely residential? 

[John Franczyk]

My son would be the commercial tenant. He has an interior architecture/furniture design-build business and wants to purchase a building that can house his workshop, provide him with living space, and generate revenue from other paying residential tenants. He would likely use the commercial space only during daytime hours. I'm helping him to build a business model based on a BRRRR strategy. My concerns on the commercial side are what extra costs will we need to put into the model to account for the fabrication space. We've already baked in amounts for 3-phase electrical service to the shop and dust and fume ventilation (planers like the one pictured generate a lot of dust). I want to make sure we're not missing any costs. Thanks for all the replies.