SAN FRANCISCO (AP) _ Mayor Gavin Newsom is proposing strict new building codes that he hopes will give San Francisco the nation’s greenest skyline.

The mayor introduced an ordinance on Wednesday that would require all new residential and commercial buildings to meet internationally recognized standards for energy and water efficiency, recycling, pollution control and other environmental measures.

The plan must be approved by the city’s Board of Supervisors. Newsom says he expects it to easily win support. Building contractors were part of the task force that drew up the proposed regulations.