At international level, numerous “green” regulations already exist for leases. In France, for example, a green annex to commercial leases has been mandatory since 2013. Among other things, the country’s regulations aim to achieve greater transparency with regard to the consumption of electricity, heat, water and waste and encourage the parties to draw up an improvement plan together. No such legal framework has been established yet in the German real estate market. As a result, various market initiatives have sought to produce a definition of a green lease that is valid for Germany over the past decade. The summary below from the German Property Federation (ZIA) aptly describes the goal of a green lease as the synergy of sustainable use of the property by the tenant and sustainable management by the landlord. Other countries are also addressing the topics of sustainability and green leases, not least because of the Paris Agreement. Like the ZIA in Germany, national initiatives are guided by the internationally recognised three-pillar model, consisting of the economy, the environment and social aspects.