Is there a limit to the type of structure I can propose for outdoor seating?
No, but we do suggest that if you plan to propose an on-street structure that you utilize a pre-engineered option. There are several manufacturers of on-street parklets or pop-up-parks that make the creation of a StrEatery easy to plan and propose. Most of these manufacturers have the added benefit of having completed a StrEatery type structure before, and have experience with life safety, building, and similar code compliance.
If you're proposing a structure that is on your own property and out of the public right-of-way, you may have already put together a design that doesn't include a pre-engineered structure. While this type of structure is perfectly suitable, please be aware that requirements on funding may preclude the cost-effective construction of your proposal.