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RICHARDSON, TEXAS — Transwestern Development Co. (TDC) will build a 300,000-square-foot office building at CityLine, a mixed-use development in the northeastern Dallas suburb of Richardson. The company is developing the six-story project, which will be branded The Exchange at CityLine in partnership with BC Station Partners, with Dallas-based BOKA Powell leading the design. Completion is slated for some time in 2022.