New purchase Rental Income Verification

[Alex Forest]

Hello, 

When assessing a potential new purchase, how may one request verification of rental income?  There are certain properties where the stated rental income is attractive compared to the sale price.  I understand that it may be related to a certain type of neighborhood.  However, in some cases, it may be a B- type area, where rent decent and price reasonable.  How does one request verification of income over the past 2 years? Bank account statements?  If there are other posts on this, I would be happy to be redirected to those, I just did not come across any. Thanks