Located on the Inner Harbor of Baltimore, Maryland, the Baltimore World Trade Center is the world's tallest regular pentagonal building. It was designed by the architectural firm Pei Cobb Freed & Partners, with the principal architects being Henry N. Cobb and Pershing Wong. Planning and design of the building began in April 1966. Construction started in October 1973. The building was completed in January 1977, and its construction cost was of $22 million.