Financing on SFH w/ garage apartments

[Matt Laird]

I was preapproved for an investment loan for 20% down 4% 15yr, up to 300k, found a property to buy & hold. My bid was accepted @ $109,800 The property is a mid 50s built 2 bed 1 bath, large corner lot, it also includes 2, 1 bedroom efficiency apartments above the garage that are currently rented @ $450 each. My finance company is unable to locate comps in my area for a triplex.. (rural Oklahoma) So they are giving me the run around.. Does this sound legit, should I pay cash, or try to locate another lender? The property is zoned single family.. Thanks in advance for your responses..