Act - the Green Building Act of 2006.

DDOE - the District Department of the Environment.

LEED - the series of Leadership in Energy and Environmental Design green building rating systems designed by the United States Green Building Council (USGBC).

Public School - schools owned, operated, or maintained by the District of Columbia Public Schools (DCPS), or a public school chartered by DCPS.

Substantial Improvement - any repair, alteration, addition, or improvement of a building or structure, the cost of which equals or exceeds fifty percent (50%) of the market value of the structure before the improvement or repair is started. If the structure has sustained substantial damage, any repairs are considered substantial improvement regardless of the actual repair work performed. The term does not, however, include either:

(a) Any project for improvement of a building required to correct existing health, sanitary or safety code violations identified by the code official and that are the minimum necessary to assure safe living conditions; or

(b) Any alteration of a historic structure provided that the alteration will not preclude the structure's continued designation as a historic structure.

SOURCE: Final Rulemaking published at 55 DCR 11318 (October 31, 2008).