General Building and grading permits that propose 2,500 square feet or greater of gross floor area or disturbance shall be in compliance with this Division, except as provided in Section 25-127(b). A Standard or Numbered Letter of Exemption from Division 2 of this Subtitle does not exempt the property from this Division. Any exemption from a provision of the Prince George's County Landscape Manual, per Section 1.1 Applicability, shall not be construed as an exemption from this Division. Landscape plans demonstrating conformance to this Division approved as part of a permit or an entitlement case or entitlement cases subject to the Transitional Provisions of the Zoning Ordinance (Sec. 27-1700) or Subdivision Regulations (Sec. 24-2700) shall be subject to the regulations in place at the time of approval of any grandfathered permit or grandfathered development application. Exemptions The following are exempt from this Division: Agricultural activities and agricultural support structures. Properties located in the Chesapeake Bay Critical Area Overlay Zones unless a permit is submitted in conformance with Section 5B-116(a)(2). The environmental setting of a Historic Site. Temporary uses listed in the Zoning Ordinance. As determined by the Planning Director.