The Park Building, at 507 Main Street in downtown Worcester, was built in 1914-1915 by the Park Trust Company, organized in 1915, which merged with the Worcester County Trust Company in 1927. The eleven-story structure was designed by two firms, Cross and Cross and D.H. Burnham & Company, both of New York. The Park Building is the largest of several office blocks that were constructed in downtown Worcester in the early twentieth century.