I need a commercial Realestate litigation expert

I have a compensation dispute with partners in connection with LLC-plaza I managed, leased, & maintained. The partners asked me to do the work. Partnership provides for reasonable compensation. They now refuse to reimburse me after plaza sale. I’ll need expert witnesses in plaza management, leasing brokerage,, maintenance services to testify as to management/brokerage/& maintenance costs, so judge can order reimbursement. Hearings in chicago. I can provide additional details as needed.