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

Consider having a mold inspection done and include the report in your listing documents to remove doubt for future buyers

The loan application information is then verified during underwriting by income documents such as pay stubs or tax returns. 

My only backup plan if I can't get verified funds is to assume the worst and to drop my counter offer even lower than my original due to the risk I would be taking on, and then when I do my in person inspection try and guess what rents are fair market for the empty units, and ask as many tenants as I can what they pay in rents monthly.Seller should give you all of his bank statements for the time he owned it, plus the operating financial documents (including rent rolls)that he received when he bought.Then find an apartment broker in the area and find out about rents in the building and in the immediate area.

Hey Marc, When tracking your real estate activities for STR management, particularly to prove material participation, it’s important to clearly document each task you perform.

So after 1.5 years of searching, putting in offers, losing deals after inspections, yesterday I finally closed on my first investment property.I put together a document of all the lessons I learned that I did not know prior, despite countless hours of investigation on my end. 

In any case, it needs to be properly documented. 

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

This approach can help you secure funding more easily without the need for traditional income documentation.

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