The use of trailers or modular office buildings as accessory buildings shall be temporarily permitted at a site for which a building permit has been issued for development of land as defined by the Municipal Land Use Law. Upon completion of the approved project, such trailer or other modular structure shall be removed from the site unless specifically authorized by site plan and/or subdivision application approval by the Edison Township Planning Board. No trailer or modular structure not permanently affixed to the ground shall be permitted unless approval is granted in accordance with the Subdivision and Site Plan Regulations, Chapter 36. Trailers or modular buildings used as an accessory building must be approved in accordance with the Subdivision and Site Plan Regulations, Chapter 36. This section does not apply to recreation or house-type trailers.