Bank referral-commercial resedential

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Hi everyone, I have historically been dealing only in 4 unit and under sized buildings. I am now ready and currently getting ready to offer on a 16 unit building near chicago. The problem is I have worked exclusively with 5/3 bank and they do not do commercial investment properties. Does anyone have any idea/experience working with good hopefully more regionally sized bank in the Chicagoland area that can work with me on commercial sized resedential investments? Thank you! Alex