Much like the term green building, green lease is a term without a widely accepted definition. (Editor’s note: this is a critical point that we will be exploring in detail in future articles in this series). A green lease can take many forms. However, the key concepts in any green lease are: (i) rent structure and operating expenses; (ii) build out of tenant improvements; (iii) sustainable development principles and regulations (throughout the building or larger development); (iv) the use and disposal of hazardous materials, including cleaning supplies; (v) recycling; and (vi) environmental management plans. A green lease will generally detail environmentally friendly products to be used, water and energy conservation methods and targets, the use of alternative sources of energy on-site, such as solar or wind, indoor air quality standards, and dispute resolution procedures.