This essay analyzes the application of green-building rating systems to historic structures. It aims to understand the advantages and/or disadvantages of the different rating systems in use such as LEED, BREEAM and SKA, when used for a historic structure. It shows that while some systems are a little more flexible to accommodate the specific requirements of a historic structure, there is, nevertheless, a need for a green-building rating system aimed specifically at implementing strategies for achieving increased sustainable use of a historic structure. The study is done by analyzing and comparing data from the Fernow Hall LEED certification project at Cornell University with the requirements of two other systems, BREEAM and SKA.