N.H. Rev. Stat. § 10-B:1

As used in this chapter: I. "Clean air" means the standards set by the department of health and human services, in consultation with department of labor. II. "Office space" means an area within a building occupied for 4 or more hours each workday by one or more state employees whose primary functions include supervision, administration, clerical support, retail sales, or instruction. "Office space" shall not include laboratories, vehicle repair facilities, machine shops, or medical treatment areas, and shall not include any other areas where the department of health and human services determines that the air quality contaminants created by the activity in the area are appropriately regulated by other state or federal authorities. III. "Building addition" means newly constructed wings or additional stories which become part of an existing building, where the total cost of constructing such additional wings or stories equals 50 percent or more of the replacement value of the original building. IV. "Building renovation" means either the interior components of a building have been removed and replaced with new components, or the existing interior components have been reconstructed, where the total cost of alterations amounts to 50 percent or more of the replacement value of the building.