Whenever a developer is required, as a condition of approval of a development permit, to construct a public facility described in a resolution adopted pursuant to SMC 3.36.020, which facility is determined by the City to have supplemental size, length or capacity over that needed for the impacts of that development, and when such construction is necessary to ensure efficient and timely construction of the facilities network, a reimbursement agreement with the developer and a credit against the fee, which would otherwise be charged pursuant to this chapter on the development project, shall be offered. The reimbursement amount shall not include the portion of the improvement needed to provide services or reduce the need for the facility or the burdens created by the development.