Tucson proper should have about 32,400 units. 

Having zero money to out down means you don't have the self control to use money properly.

Units in Cleveland do well too, but I personally wouldn't buy an STR in Cleveland proper until this legislation gets sorted out. 

Youll find some in Takoma Park (rent control in the city limits so be aware of that) then in DC proper.

Give them notice rent is increasing by 10%, or whatever you think you can increase it to with repairs, with proper notice.

If you have a recorded mortgage and the county did not properly notify you about the tax sale, then the tax deed can legally be voided.I would get a copy of the tax collectors file and see if there is any mention of your recorded mortgage.I would talk to the tax collector and see what the story is and then inform your attorney.

Provide proper notice of non-renewal near the end of the lease term and then sell when they move out.

I am looking to make my first investment, and am curious about how to do proper market research.

A proper lease with separate option to buy I don't think is a starting out proposition.When it doesn't work with your cousin do you have a back up plan? 

As long as it was done properly, we'd be fine.