65 ILCS 5/11-15.1-4

Any annexation agreement executed pursuant to this Division 15.1, or in conformity with Section 11-15.1-5 hereof, shall be binding upon the successor owners of record of the land which is the subject of the agreement and upon successor municipal authorities of the municipality and successor municipalities. Any party to such agreement may by civil action, mandamus, injunction or other proceeding, enforce and compel performance of the agreement.

A lawsuit to enforce and compel performance of the agreement must be filed within the effective term of the agreement or within 5 years from the date the cause of action accrued, whichever time is later.