The LEED Green Building Rating System for Existing Buildings: Operations & Maintenance is a set of performance standards for certifying the operations and maintenance of existing commercial or institutional buildings and high-rise residential buildings of all sizes, both public and private (offices, factories, retail and service establishments, institutional buildings, hotels, and residential buildings). The intent is to promote high performance, healthful, durable, affordable, and environmentally sound practices in existing buildings.

Prerequisites and credits in the LEED 2009 for Existing Buildings: Operations & Maintenance Rating System address 7 topics: Sustainable Sites, Water Efficiency, Energy and Atmosphere, Materials and Resources, Indoor Environmental Quality, Innovation in Operations, Regional Priority.

GREENVIET provides the consultancy services in getting this LEED certification.