الفهرس 
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Abstract
Building information modeling (BIM) and green building are currently two major trends in the architecture, engineering and construction (AEC) industry, so, to achieve the efficient energy consumption in Office buildings, which consume a large amount of energy compared to other building types, Sustainable buildings are the best choice. This research aims to identify several sustainable designs that can improving the energy performance of office building by using simulation programs (BIM) such as Revit Architecture 2018, Green Building Studio. Building Information Modeling (BIM) is an evolving technology, continuous research and software development that offers opportunities to address current problems and improve the process. Even though Building Information Modeling is till now comparatively recent, those people who have been taking advantage of it have shown that the 3D modeling and related data lessens design mistakes, ameliorate quality of design, reduces construction schedule, and significantly lessens building costs. Administrative building of Faculty of engineering at Mansoura is chosen to be the case study to demonstrate which materials have helped in reducing the energy use of the building. At the end, alternative, sustainable designs suggested for more energy savings.