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WALTHAM, MASS. — J. Calnan & Associates has completed Phase I of the 85,000-square-foot renovation of Constant Contact's Waltham headquarters located at 1601 Trapelo Rd. A new Network Operations Center was built, which includes state-of-the-art audio/visual equipment and a media room for online podcasts. Phase II of the project will include the creation of a Great Room, which will be used for large training events. The project team also includes Visnick & Caulfield and WB Engineers.