Are there wheelchairs available for use?

Yes. Beautiful place but go accompanied. There are enough homeless there.

Sure, actually have never seen anyone in a wheelchair on Church St. But I recommend bigger tires since the cobblestone can be bumpy.

Yes

No

I haven't seen wheelchairs to use like there are bikes in certain parts of the city and surrounding areas but you can ask city hall, I bet they would have a more concrete answer.