Small banks that will lend on condo's for investment

I am finding great deal's on condo's in the city of Chicago, but running into trouble when I try to finance them, mainly because they are less than 50% owner occupied.  Other than private money, what are some alternatives to get a mortgage? assuming I put 20% down. Note that I am aware of a lot of companies that do this for houses, but for "condo's" I don't really know of any.