Echoing what others have said, check your local zoning. Some communities also regulate where and for how long you can park trailers, home-based occupations, what you can (and can’t) do in a garage, etc. There are also Board of Health regs to consider–distance between kitchen and serving line, if they’re seperate, storage and cooling facilities, etc. Believe me, it will save you a tremendous amount of time and very possibly money if you check with your local officials first. They’ll be able to tell you about properties you’re looking at, whether or not what you want to do is permitted by right there or whether you’ll need a variance of use (waiving the permitted uses ordinance) to open a restaurant or commercial kitchen, parking requirements, etc. Realtors won’t always tell you everything you need to know, or may not know–ordinances can vary widely between jurisdictions and it can be a lot to keep up with, and it’s best to know on the front end if something is either permitted or easily approved, or not–could save you from buying a property you may not be able to use for what you want to use it for.