(a) A condemnor and a condemnee or two or more condemnees may enter into and comply with the terms of an agreement in conformity with this article for the arbitration of any issue relating to the amount or the apportionment of compensation for the taking of property.
(b) An agreement to arbitrate does not constitute and shall not be construed as a waiver of or excuse for noncompliance with any requirement of Article 2 or 3 relating to the acquisition of property except to the extent expressly provided in the agreement.