The applicant may apply for and the Planning Board may grant extensions of such preliminary approval for additional periods of at least one year but not to exceed a total extension of two years, provided that if the design standards have been revised by ordinance, such revised standards may govern.

In the case of a site plan for an area of 50 acres or more or conceptual master site plan approval, the Planning Board may grant the rights referred to above for such period of time, longer than three years, as shall be determined by the Planning Board to be reasonable, taking into consideration the number of dwelling units and nonresidential floor area permissible under preliminary approval, economic conditions and the comprehensiveness of the development. The applicant may apply for thereafter and the Planning Board may thereafter grant an extension of preliminary approval for such additional period of time as shall be determined by the Planning Board to be reasonable, taking into consideration the number of dwelling units and nonresidential floor area permissible under preliminary approval, the potential number of dwelling units and nonresidential floor area of the section or sections awaiting final approval, economic conditions and the comprehensiveness of the development; provided that if the design standards have been revised, such revised standards may govern.

Any application for extension of a preliminary site plan or preliminary subdivision approval must be filed with the Planning Board before the expiration of the initial statutorily protected approval period, as set forth in the MLUL and the respective sections of the Township of Union Land Use Ordinances, expires. Any application for extension made after expiration of the applicable initial statutorily conferred approval period shall be deemed untimely and denied.