Shareholders of a Fort Wayne mall's current owners have agreed to be acquired by a global commercial real estate company. Chicago-based GGP Inc. (NYSE: GGP), which owns Glenbrook Square in the Allen County city, is slated to merge into Brookfield Property Partners LP for an estimated $15 billion. Glenbrook Square, which includes more than 130 retailers in over 1.2 million square-feet of space, is GGP's only property in Indiana. Its most recent renovation came 20 years ago.