A franchisee may not require a subscriber or a building owner or manager to enter into an exclusive contract as a condition of providing or continuing service, nor may a franchisee enter into any arrangement that would effectively prevent other persons from using the OVS to compete in the delivery of cable services with a franchisee or its affiliates. However, nothing herein prevents a franchisee from entering into an otherwise lawful, mutually desired exclusive arrangement with a building owner or manager of a multiple-dwelling unit or a commercial subscriber.