Otaishan Consulting Engineers (OCE) is a multidisciplinary professional engineers, architects, planners and engineers, which was founded in 1991 by Dr. Abdul Aziz bin Turki Otaishan. OCE is today one of the leading engineering consultancy in the Kingdom of Saudi Arabia, the Gulf States and the Middle East, which consists of from more than 320 employees to form a team of professionals, technical and administrative staff. Over the past 22 years, OCE successfully undertaken in the design and supervision of a large number of projects, has been developed in the process of considerable experience in conceptual design, engineering, and supervision to enable them to participate in many local and international competitions .