Much like the rest of the green building industry, green leases contain a collection of legal risks that landlords and tenants have not previously had to consider. This article considers a small sample of such problems, specifically in relation to certification requirements, cost issues, insurance provisions and green product issues. Many companies and government agencies require their space to satisfy an applicable LEED for Commercial Interiors certification level. These entities look for a lease to specify that the space will meet such standards. Landlords are not generally in the position to guarantee such certification level. The project architect, general contractor, subcontractor and USGBC all have a much greater impact on whether the space meets the required certification level. The landlord will thus need to make sure it is working with contractors and architects that understand the issues and are able to work towards achieving the necessary certification levels. It will need to protect itself in its applicable project contracts. The landlord and tenant must work together in attempting to craft a lease that adequately protects each of their respective interests and avoids liability outside of either of their control.