ﻣﺮاﺣﻞ ﺗﻄﻮر اﻟﻌﻼﻣﺔ اﻟﺘﺠﺎرﻳﺔ REAL ESTATE INVESTMENT CONTRACTING ﻟﻠﻣﻘﺎوﻻت اﻟﻌﺎﻣﮫ واﻟﺗﻧﻣﯾﺔ اﻟﻌﻘﺎرﯾﺔ