I haven't attended it but the person who organizes it is a member of Bigger Pockets.

To specifically address your point #4 in your post, check out a Company called Polser USA which has a patented FRP product currently used in RV’s that has been clinically proven to kill micro organisms and is chemical free.

If he’s organized, it won’t take long for your realtor to produce this info.

Hi, I’m not an investor (yet) but I volunteer with a student organization with most of the students living in Uptown.

I am sure you have your shed and basement storage organized to your needs and usefulness.  

I've always been good at organizing stuff like that! 

However, if you have a bad credit standing, you may not be able to access loans for many organization.”

Heck — one sponsor with whom I invest creates a 501(c)(3) organization specifically to help their tenants — and have raised about $600,000 from investors, employees, and management to help defray their tenants’ costs.

My point is I don't think Detroit is as organized to start using info from the water for blight and building as they are not even using all the data already available to them. 

There is no exception to not pay the sales tax unless you qualify as a non profit or there is a state exemption.