Need advice, Analyzing an investment property - Due Diligence

[Jonathan B.]

Hi Guys,

Which ways/methods do you suggest using to confirm that the details (income/expenses) that a potential seller presented on a specific deal,

example, seller reported that a potential house is never vacant year round - which in this case i guess i could use "Schedule E"(?) and confirm his statements of income from the specific property?

What is legitimate and is common to ask the seller to provide as part of the transaction regarding the above?

Thanks alot