Seller will pay all real estate taxes and all general, special, respread and reassessed assessments through the last installment immediately preceding the Closing.

Read All Of This Please Entering a contract with a financing arrangement turns your unilateral sale contract into one with bilateral agreements, you can not assign a bilateral agreement without the consent of the seller.A subject-to sale is an installment sale by the seller, you make payments and when the debt is paid off,  you clear the encumbrance with full title, the seller can't convey full title until the debt is paid. 

One possible solution, if it's an ancillary bathroom is to remove what's there and install a one-piece surround with tub.

So instead of asking what the condition of the roof is, I ask when was the roof installed or last replaced.

Florida homes are built on a slab so to install proper ac/heating you have to cut channels or venting channels in the concrete/floor you could come through the attic but that's not green and a professional would advise against it, is the ac your biggest desire to update?

When you change them, install the clean ones and take the dirty ones with you.  

You could even lay out some purlins and install real metal roofing.

The "resident" installed new doors that the owner paid for and sheet rock was also delivered.

I recently had a well known national flooring company come to my new house to install vinyl flooring in a bathroom.

I would install baby monitor cams in the common area so that he/she can see everything.