In this section the following words have the meanings indicated. “High performance building” means a building that: meets or exceeds the current version of the U.S. Green Building Council’s Leadership in Energy and Environmental Design (LEED) Green Building Rating System Silver rating; or achieves at least a comparable numeric rating according to a nationally recognized, accepted, and appropriate numeric sustainable development rating system, guideline, or standard approved by the Secretary of Budget and Management and the Secretary of General Services. “Major renovation” means the renovation of a building where: the building shell is to be reused for the new construction; the heating, ventilating, and air–conditioning (HVAC), electrical, and plumbing systems are to be replaced; and the scope of the renovation is 7,500 square feet or greater. It is the intent of the General Assembly that, to the extent practicable: the Commission shall employ green building technologies when constructing or renovating a Commission–owned building not subject to this section; and high performance buildings shall meet the criteria and standards established under the “High Efficiency Green Building Program” adopted by the Maryland Green Building Council. Except as provided in subsections (d) and (e) of this section, if a capital project includes the construction or major renovation of a building that is 7,500 square feet or greater, the building shall be constructed or renovated to be a high performance building. The following types of unoccupied buildings are not required to be constructed or renovated to be high performance buildings: warehouse and storage facilities; garages; maintenance facilities; transmitter buildings; pumping stations; and other similar types of buildings, as determined by the Commission. The Commission may request from the county where the proposed capital project is located a waiver from complying with subsection (c) of this section. On receipt of a written request of a waiver under this subsection, with approval of the county executive, the county council of the county where the proposed capital project is located may issue a waiver under this subsection if the county council determines that the use of a high performance building in a proposed capital project is not practicable.