The Saudi Stock Exchange's benchmark index Tasi ended 0.39% lower to close at 6,395.49. Bellwether Sabic lost 1.37% to finish at SR89.75. Sabic and partner firm Saudi Arabian Mining , also known as Ma'aden, plan to produce around one million tonnes of phosphates next year at a joint venture plant in Ras Al Zour, the Saudi Gazette has reported. Shares of Ma'aden added 1.60%, ending at SR22.25. Real estate developer Dar Al Arkan dipped 1.49% to close at SR9.90. According to a survey done by Jones Lang LaSalle, developers expect a 12% in the real estate market in KSA for 2010, the highest yield expectation in the GCC and an increase of 1.21% over the previous year.