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

Even with this carve out available, it does plainly state that a taxpayer does still have the option to go back and amend the prior year return - so both answers can be correct.I would have your CPA/EA review your situation and the related Revenue Procedure to verify you are under this section, which would allow filing of the 3115 instead of amending the prior year return. 

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

They need the records for your rental properties to verify and calculate the PITI. 

Last week, I learned about Section 8.52.110 which is an LA County regulation requiring an owner to compensate residents they are evicting through the Ellis Act (no-fault) anywhere between $7k and $20k depending on the number of rooms in the apartments and the age/disability of the resident being evicted.I believe Hermosa Beach follows this rule, the city lies within LA County, but can't verify with anyone from the City if the City has a rule that supercedes the LA County rule.Can anyone with knowledge of this rule and how it is applied point me to a website or other source of information that would answer this question?

We would just need to verify you have credit history here in the US, and an ITIN letter. 

An estoppel certificate can also help verify the terms directly with the tenants.Market Research: Look into neighborhoods where multifamily properties are more common.

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

I've worked with a lot of property managers and landlords on mold remediation projects and my experience has shown me the best time to find mold is when the property is completely vacant, and here's why.First, when you find mold you should verify that what is found is in fact mold.

The majority of that time is spent verifying rental income for the unit mix in the property.