In this subtitle the following words have the meanings indicated. “Agricultural building” means a structure that is used primarily to cultivate, manufacture, process, or produce agricultural crops, raw materials, products, or commodities. “Agricultural building” includes a greenhouse. “Building” has the meaning stated in the International Building Code. “Commercial building” means a building that is subject to the commercial provisions of the International Energy Conservation Code. “Covered building” means a building that: Is a commercial or multifamily residential building in the State; or Is owned by the State; and Has a gross floor area of 35,000 square feet or more, excluding the parking garage area. “Covered building” does not include: A building designated as a historic property under federal, State, or local law; A public or nonpublic elementary or secondary school building; A hospital; A manufacturing building; or An agricultural building. “Critical infrastructure” has the meaning stated in § 1–101 of the Public Utilities Article. “Direct greenhouse gas emissions” means greenhouse gas emissions produced on–site by covered buildings. “District energy” means thermal energy generated at one or more central facilities that produce hot water, steam, or chilled water that then flows through a network of insulated underground pipes to provide hot water, space heating, air conditioning, or chilled water to nearby buildings.. “Manufacturing building” means a facility in which manufacturing, as defined in § 2–1202 of this article, takes place.