Islamic Egypt (Cairo) is rich in many heritage buildings that expressed the Integrative transition in the Islamic style between different eras through Place and Time, and also through the effect of Restoration in the conservation of heritage buildings. The Integrative Transition is embodied in both Historical and Symbolic values that constitute the architectural and Interior design features, as well as the various determinants of Islamic-styles. The research includes studying aspects of the transition in the Islamic style between the Mameluks and Ottoman eras and how they were integrated into the architectural and interior design of Sunqur Al Saadi Madarasa (School) “Mameluks era" and the Dervish Theater “The Ottoman-style". The Complex Building of Sunqur Al Saadi Madarasa (School) and the Dervish Theatre was restored and renamed as The Mevlevi “Mawlaweyya" Museum (The Italian Institute of Culture and the Egyptian Antiquities Organization-Cairo, Egypt); as a place integrated through two different eras in Islamic Architecture and Interior design.