The Planning Board and/or Zoning Board is explicitly authorized to, and may, as it deems appropriate, retain an independent technical expert as it deems necessary to provide assistance in the review of the site location alternatives analysis and any technical materials submitted, especially in those cases when a technical demonstration of unavoidable need or unavailability of alternatives is proposed. The applicant shall pay the reasonable costs of the review, incurred by the City, which costs shall be deposited in accordance with the City's escrow ordinance and which shall be in addition to any required escrow requirements for development applications otherwise required by this chapter and/or Site Plan and Subdivision Ordinance.