The provisions of this article notwithstanding, nothing herein shall prevent a developer or owner from voluntarily agreeing to pay, and the Borough agreeing to accept, an amount, either by way of direct contribution or in-kind services, that the developer or owner agrees reflects the pro rata or proportionate share of the cost of providing reasonable and necessary off-tract improvements or facilities required by the construction or improvements to be approved pursuant to a respective development application. In such a case, the Borough and developer or owner may enter into a developer's agreement that provides for said direct payment or in-kind services in lieu of any contribution provided for pursuant to the provisions of this article. In addition, the Borough may waive the requirements of this article for any duly authorized redevelopment project.