USAA Real Estate Co. has plans to add an additional building and parking garage to its complex near The Shops at Legacy in Plano, and city officials are on board. Plano Planning and Zoning Commission on Monday approved a preliminary site plan to make way for the planned construction on the 22-acre lot northwest of Parkwood Boulevard and Legacy Drive. USAA media representatives did not immediately reply to request for comment Thursday afternoon. The Texas-based company offers a variety of products to members of the military and their families, including insurance, investment, banking and real-estate services. The approved expansion comes in one of the quickest-growing areas for office developments in North Texas, with corporations like Toyota, Liberty Mutual and JPMorgan Chase opening multi-story buildings just across the Dallas North Tollway. Toyota’s North American headquarters is set to hold its grand opening Thursday evening at Legacy West.