Credit Union vs Big bank commercial loan question

[Hope S.]

We are working on a loan for a 5 unit, using a commercial loan from a credit union.  The credit union has requested the seller's IRS Schedule E.  We're getting some pushback from the realtors, suggesting this request from the credit union is unusual.   Wouldn't a big bank also require the Schedule E?  If the seller cannot produce a Schedule E will we have some alternative way to verify the numbers for our lender?