The purpose of this study was to evaluate and determine different energy components existing within historic buildings that will contribute to the development of guidelines for applying modern technology systems within these strucutres and to show the financial, social and physical benefits, which may result without altering the architectural and cultural significance of the building.Union Station, Indianapolis, is an example of historical and architectural ingenuity. If proper and selected energy systems are applied, Union Station will be a strong active force for revitalizing the surrounding area, which has deteriorated and fallen into disuse in recent times. Similar examples of significant historic buildings are scattered all across the country, and with the new development taking place, these historic structures, which are the physical and visual links between us and our past, are being thregtened for the sake of the "glass-box". This study shows the many advantages in preserving these historic links whether economically, architecturally or socially, by bringing the best technology of both worlds and molding them into one system, in which both technologies work together and compliment each other rather than be an isolated system. / Department of Architecture