Did my own vanity of marble tiles and would not do it again, too porous no matter how much you seal.Photo is of super cheap cabs with $5/ft granite tiles.

Then study on Landlord laws to make sure you are not violating any city or state statues and to understand thoroughly the processes you need to take to collect pass due rent or worse case start eviction.

Hi,Read tax deed law:www.queenoftaxdeeds.comwww.buyingtaxdeeds.com/myorranotesFlorida Statue #197 Tax Lien Law197.562 Immediate Possession

A good tax sale attorney should not only know tax sale law inside and out he should be willing to search for court precedents on such matters if the statues area not clear.

There are laws with statue of limitations on encroachment. 

Read the actual general statues and become familiar with them.  

You need to read the statues on lending.

Recessed lights, hardwood flooring, white walls ( to look more spacious), landscape the backyard, maybe some fake marble look alike countertops because the ones they have at the moment are ugly.

I dropped in a 7ftx5ft window in the old rotted out bay window opening (picked it up at Bargain Outlet for $98), yet the small upper bathroom window cost $185 to avoid destroying the old marble window sill & header. 

Just be careful as always to not overbuild small spaces, i.e. marble floors in the attic still isn't going to change the fact that its a small attic which will really limit how far the rent can rise.