Start off with City Hall, and the local cop shop. They are usually thrilled to have someone who wants to FOLLOW the laws, rather than ask forgiveness. My city hall was very helpful on busking in the city limits. So was my cop shop (different area than yours, but: no liscense necessary, you can play from 8am to 10pm acoustic or amped, on any public property. For private property, check with owner. On sidewalks, don't block 'em. It is interesting....we DO have laws specific against panhandling, but it is okay to busk)
I do recommend paying a visit, rather than calling. If they see you as a professional, who will be an asset, you will get a better response than a phone call.