8/11/2016 @ 9:37 AM - SL Green Realty sold a 40 percent stake in office tower 11 Madison Avenue to Prudential's real estate subsidiary for $480 million. The deal values the tower at $2.6 billion including lease-stipulated improvements - the same price SL Green paid when it bought the tower from the Sapir Organization and the CIM Group last August.  In a statement SL Green said...