If you sold and rebought the identical condo in the same building your cost basis would be the new higher cost, so you’ve captured all the gains tax free.  

I have savings that I live off of.

Check out bullet point 3 under (a) eligibility requirements which verifies that the borrower must be used for personal use and enjoyment (ie. you cannot use the property if you rent it out more than half of the year).

Income verified online through borrower's source of choice such as bank statements, asset accounts, paystubs and IRS tax filing. 

Couple, he's a post-doc (low income, but verified 6 mos rent in savings).

Establish your buy box and really get to know the territory in the specific area you are looking at and then trust, but VERIFY

My only suggestion with Zillow is to TRIPLE check the persons Identity (Have them show you their driver license during a showing), Call their last landlord, and call their employer.

Maryland LLCs are public information.Why would you want to hide your identity from your tenants?

But good point, this is another document I can request so I verify no discrepancies from what I’ve tracked.  

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?