This question mainly depends on your rent. If the second floor is only an additional condition, then the rent will not account for a high proportion in the overall budget. The following considerations can be made: half of it is a private room, and the other half can be a booth or a hanging chair by the window. Because it is a casserole, the types of products operated need not be adjusted too much without increasing too much investment. Never rent the first floor to others, because the facade is very important, and the catering business will also have a convenience. Because your stairs are still on the first floor, it's more troublesome. I don't know the location of the stairs. If possible, it's not bad to seal a passage with a small door to the outside. It's also good to make a small leisure bar on the second floor. It's also good to make a small private room with drinks, popcorn and beer, but it all depends on the location. It is not recommended to engage in other catering forms, which will have an impact on your main business targets downstairs and increase more manpower and investment.