Why am I quoted 25% downpayment for a quadplex in IL?

[Clint LeClair]

Hello all, and thank you ahead of time for reading and hopefully helping me figure this out.

I'm investing in a college town in Illinois while we live in another state (California).  We found a quadplex that we'd be renting out all 4 units.  I've been going around to the different mortgage brokers and I'm getting numbers that just don't make sense to me.  With a 740 credit rating, I'm quoted a minimum requirement of 25% down for 5+% interest for a 30 year note.  What gives?  What happened to 4% interest and 20% down?  I'm told that the minimum is now 25% for investment properties.  Can someone shine some more light on this?  I asked the brokers that quoted us these numbers.  Their responses were all some variation of "this is how it is now."  Pressed to explain in more detail, they demure away from further explaining.