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WASHINGTON, D.C. — Vertical construction of the first phase of Trammell Crow Co.’s 413,000-square-foot Sentinel Square office building is complete. The 12-story, Class A property is located at 90 K St. in Washington’s NoMa district. Sentinel Square is being built to LEED Silver specifications. Detroit-based SmithGroup designed the project, and Houston-based Haynes Whaley Associates is providing engineering services.