Best loan option for multi-family refinance

Greetings to everyone. I own a 6-unit apartment building in Illinois, I paid cash so I own it outright. Currently only 3 of them is being rented, the other 3 is still under renovation. I really want to take a loan against my rental building so I can buy more investment properties, but my situation is I don't have tax returns ( new immigrant and this property has only generated income for 6 months), any suggestion on which financial institution can help a case like mine?

Thanks in advance

Rebecca