Do you ask for proof of rental payment history?

[Payman A.]

Hi everyone,

So I'm in escrow for a 4plex that is fully occupied and currently manged by what seems to be an experienced and well organized firm.  1 of the units has been occupied since 2010, 2 since March, and 1 since Mary (2 are section 8).  Is it common to ask for proof of rental payments for past 3 months (or first month in case of the new tenant)?  I'd like to be diligent without being excessive.

Thanks and looking forward to your thoughts,

Payman