*ive received copies of the leases..1 of them was not signed by the tenant (who happens to be an elderly lady that has been living there for 24 years..any advice on how to navigate this? 

Right now she has a Occupational Therapist in the downstairs (1/1) and an elderly couple who had a major flood and insurance is paying for it.In Atlanta, I am betting you will have all sorts of possibilities.

This tenant an elderly lady who's on section 8.

The seller, who had inherited the home, wanted to sell and move in with her elderly father.

There is currently an elderly 20-year long tenant who has taken good care of the home.

I see 55+ communities near, at or above $1k/mo -- a lot of elderly residents on fixed incomes are being priced out.  

Good luck,, If the man used a credit card without authorization, then call the police, even if it was awhile ago, file a report, get print out of the credit card charges for the report, and notify the credit card company,  This happened to me basically, a guy took my elderly mom's card, he had done some work in the house,, 2K worth of charges, I filed report with police, notified credit card company, and the credit card company took off the charges and police / card company worked out payment plan with the offender,, he was also a former inmate..  

For example, many elderly individuals purchase condos in Florida to retire.

Especially the elderly, who have been in a nursing home, assisted living or some institution. 

I live in Maryland and the elderly owner, and the property are in California.