High Commission For The Development of ARRIYADH (ADA) will establish a 20,000-square-meter plaza at the eastern part of the King Fahd National Library. “It will be one of the most modern open squares that have been built in the capital city,” said a press statement issued by the ADA on Monday. The square will be “a welcome addition to the recreational facilities for the people living in the city.” The ADA is concerned with the development of the Kingdom's capital city. Its Chairman is Prince Salman bin Abdulaziz, Governor of Riyadh Region.