The acquisition by Mack-Cali, which already owns a neighboring Iselin office property, came after the company sold a three-story, 88,910-square-foot office building at 201 Littleton Road in Morris Plains to Chopp Holdings for an undisclosed sum, as noted by GlobeSt. Mack-Cali also announced on Monday its sale of a 56-building office/flex portfolio to an affiliate of the Robert Martin Company for the aggregate sum of $487.5 million. GlobeSt reported that the latter move by Mack-Cali is part of an ongoing effort by the REIT to divest itself of properties that are either not prime office locations near the New Jersey waterfront or multifamily residential. The outlet noted that the properties being sold by Mack-Cali to Robert Martin's RMC Acquisition Entity are in Westchester County. Mack-Cali will use a portion of the proceeds from the sale to pay down $230 million in unsecured debt. [NJBiz]