The Planning Board may recommend more restrictive conditions or any further reasonable conditions deemed appropriate with respect to the suitability of the Planned Neighborhood Business District and the neighborhood. Adequate guarantee in the form of either a certified check or an approved surety bond shall be given prior to approval of the plan, to assure that all parking entrances, exits, facilities and services are installed as required. The amount of the guarantee shall be determined by the Township Engineer and shall be payable to the Township of Willingboro.