What is the purpose of buying a bus, is it to live in? If so you would be prudent to check out local codes about buses. I am fortunate that I live outside of city limits and codes are pretty much non existant. After living in Memphis, TN, for many years and fighting with code enforcers just to keep a licensed, insured and fully functional motor home in my driveway that you are wise to check code and also home owners associations which are as bad if not worse. One neighbor can cause you much grief.
Most times you cannot park them or work on them and storage is expensive. I live in the sticks now and for the last 9 years I have not been visited by code or HOA and it is wonderful to be able to do what you want on your own property.
Good luck on your search for a bus and I am not trying to talk you out buying one, just don't want you to have any surprises.
Oh, by the way my bus is a 1984 chevy short bus.