QIC Global Real Estate has doubled its money in less than three years by selling an office tower sitting opposite Brisbane's new Queens Wharf casino precinct for $159 million.

As foreshadowed by The Australian Financial Review in November, Singapore-based AEP Investment Management led a hotly contested race to buy the 27-storey tower at 41 George Street from a QIC property fund which had bought the property from the state government in 2013 for $80 million.