RIYADH: Saudi National Housing Co., one of the largest developers, has signed two agreements for a total of SR1.27 billion ($338 million) to develop residential units in Riyadh. The first agreement was signed with Retal Urban Development Co. to build 759 housing units worth an estimated SR864 million, according to a bourse filing. The second agreement was signed with Sumou Real Estate Co. for constructing residential units valued at SR403 million. Both projects are expected to improve the company’s results at the beginning of sale and implementation, according to the statement.