Likewise, major alterations and change of use would require the structure to meet the new HERS (Home Energy Rating System) score.

For example, if your credit score requirement is 640, consider only allowing pets if the tenant has a 700+ score.

Local community bank or credit union would be my go-to.

You should not have a problem opening an Series LLC account with a state bank or credit union bank. 

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

Pull your own and ask them, "With credit of FICO SCORE, what rate and term can you offer me?" 

Loans typically get paid back on a refinance or buy out period but if the property fails to gain enough equity within that period of time it can be a lost deal and painful.I would advise you to look into traditional or Non/QM financing where you use your credit score or income to buy the home.

This may need to be taken with a grain of salt, but I have looked each up on Trustpilot and included the scores below.

If it's too much you can always move your business to small local banks / credit unions but there is another price to be paid.

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