Not mom, dad son/daughter and son/daughter in-laws. 

About your concerns on rents: you'll be hard pressed to find an example in modern history where rents declined in a meaningful way, not even 2008. 

Her son and daughter (who stay there but pay no rent) refuse to leave.

For this type of sale, the focus is on the quality of the property, the history of the current tenants, and the numbers.

The bank needs two years of rent history to assess the value of the building.

But I've targeted an average of 3 properties each month for about 10 months now, so you can do the math here.I've been going to the auctions for only a year, so I don't offer much history.

The eviction history information would be more useful if it were tied to specific rental history. 2.

Biggest issue is that 2 of the buildings have history of flooding.

I ran the Transunion SmartMove background check with credit report, criminal history, and eviction report and it came back clean, but had to reject two other applicants after their SmartMove scores came back low for low credit scores and numerous pre-eviction filings at local courts.  

I had a very nice couple with a young daughter come look at my nicest rental home (4,300sq ft with $2,800 rent).