All streets, sidewalks, sewers, and water lines in any Industrial Park District shall meet Municipal standards. As a condition precedent to the issuance of a zoning certificate, streets, sidewalks, sewers, and water lines shall be installed or performance guaranteed in an approved manner and at grades and locations in streets abutting lot lines as approved by the Municipal Engineer. Where, however, not all or substantially all of a plot is to be utilized initially, the Planning Commission may authorize the postponement, until further improvements are to be made of as much of the installation of streets, sidewalks, sewers, and water lines or other improvements as is reasonable under the circumstances with due regard to the use to be made of the lot or lots, the drainage and traffic problems of the area.