They may also require US credit history, although there are a handful that will not require a US credit report for an increased rate/ reduction in LTV. 

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

Also Mike, why is cash out higher with refi, do you mean just with the credit union scenario? 

We are fair housing compliant regarding animals.Our tenants’ safety and the peaceful enjoyment of their home is important to us, so we do a credit/criminal background check on all applicants aged 18+, as well as employment and prior landlord verifications.

Others want a higher reward so take on more risk, like low credit tenants.

Either would be a great option; I'd probably choose Roseville because it's more established, but the City of Elk Grove deserves a lot of credit for its impactful growth programs, so it wouldn't be a bad option. 

Maybe some credit challenges.

Credit reporting is a no-brainer, and Baselane is excellent for releasing it!

On one hand, there're a number of legitimate tax deductions, credits, and loopholes that are not well-known.

Any prospective resident with bad credit or a prior eviction is going to have an impossible time finding a place to live.