Heritage has been a component of social cohesion, cultural integration, and identity. Therefore, the preservation of heritage supports the understanding of the past, present and transferring it to future generations, which necessitated the prevention of the demolition of historic buildings to remain as a gateway to the fundamental identity. The conservation of old buildings has either been restored and preserved the artistic and historical heritage, protecting the historical distinguished elements and the recent use of the historical building. The conservation of energy and the safety requirements, as well as economic benefits through good tourism management, So, There was a need for a methodology for sustainable assessment of the heritage environment in order to estimate the urban values associated with history which emphasizes the aesthetic values of the fundamentalism. Therefore, the research comes to study the aspects of preservation of heritage and orientation to sustainable thought or “Heritage Sustainability" which is defined as a future of conservation of heritage. Sustainability is a term that inherent in historical buildings' location, design, interior solutions, and raw materials used to adapt to climate and local environment when the technological progress hadn't been existed. Therefore, the research will be an analytical study of historical architecture and palaces in Cairo, and an attempt to shed light on the important role that preservation of heritage can play in achieving sustainability goals answering questions about how these standards move to present, how to deal with them without harming the environment and the possibility of re-use them optimally.