Real Estate Investment and Its Role in Housing Development A future vision for the Mid-level Housing opportunities under The free market economies" An analytical study of the International Experiences for the Development of new Sustainable Urban communities to conclude a new conceptual model for The develop and sustainable of the new urban communities in Egypt Applying the concepts of sustainable urban development on the historic commercial areas A case study the Roxy in Heliopolis area"." Transformations in housing policies and their impact on the urban development and Real estate market in Egypt EGYPTIAN ARCHITECTURE IN THE SECOND HALF OF THE 20TH CENTURY