The first and only green standard consistent and coordinated with the ICC was approved in January 2009. Known as ICC-700, the standard addresses the design of green residential buildings from single-family to high rises. It includes a rating system that lets builders, designers and communities choose the levels of performance. This standard was developed in cooperation with the NAHB as their National Green Building Standard. The standard includes provisions covering land conservation, rainwater collection, and construction of smaller homes to conserve resources. Along with the standard, the ICC is working on a green building technologies certification program for building officials, building inspectors, and planners and zoning officials.