I'm in San Diego and the SD parking Enforcement website addresses illegal parking in public areas, and vehicles abandoned on public or private property for 30 days, but if they're living in it for that time I wouldn't think it would be abandoned.

This is not efficient, but when I was in the field consistently it didn’t take any time to shoot an address back to my office to research.

Factors I'm aware of that might help determine the most efficient answer:-tax writeoff of interest portion of mortgage payment (most impactful during early years of mortgage) -margin of net rental income after all expenses -ability to qualify for attractive interest rates on additional mortgagesBasically I'm just trying to get the most bang for my buck.

But the owners don’t have the address or outside pictures of the house.

I don't think you would be able to because you have to give an address for each listing

However it wouldn't be very cost efficient to do two refis within 6 months of each other (delayed, then cash-out based on ARV) since each closing would probably cost approx. $3k.

Scam@gmail email address?

Reliable, relatively inexpensive, and efficient to run. 

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

Despite its small size, the associated expenses--especially if you hope to add in a loft, address sewer/septic needs, and bring it up to code--may be significant.