OID, or Green Building Observatory, aims at promoting sustainable development and innovation in the real estate industry. It gathers more than 30 real estate actors. They are convinced of the value of sharing best practices. OID’s topics of interest include smart cities, energy management, innovation in buildings, biodiversity, among others. They accompany members to identify innovative practices through events, working groups and publications, helping them measure and reduce their environmental and energy footprint. OID publishes an annual barometer of the environmental and energy performance of tertiary real estate.