The 1.4 million-square-foot, three-building portfolio last changed ownership in 2015 for $300 million. : Piedmont Office Realty Trust has finalized the acquisition of the Galleria Office Towers, three Class A high-rise buildings totaling 1.4 million square feet in Dallas. CBRE Global Investors sold the properties for nearly $396 million, according to public records. The deal included the properties’ adjacent parking structures and a 1.9-acre land parcel located at the junction between Dallas North Tollway and Interstate 635. The assets last traded in 2015, when the seller purchased them for $300 million from Cannon Commercial.