Final answer:
In Illinois, a commercial real estate broker can place a lien against the property before closing if they believe they will not receive their commission from the seller of an office complex.
Step-by-step explanation:
In Illinois, a commercial real estate broker can place a lien against the property if they believe they will not receive their commission from the seller of an office complex. However, the lien must be placed before closing. This means that the broker should take the necessary legal steps to secure the lien rights prior to the completion of the sale.