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Circa: 1890

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41 Seyon St. & 43 Foundry Ave. Waltham, MA

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485,000 ft2


The building was originally built as a button factory and then was used for manufacturing. It was inhabited by Metz Company from 1908 to 1922. Metz was originally a bicycle and then eventually a car manufacturer.

In 1941 the buildings were purchased by Raytheon and housed both their corporate headquarters and extensive manufacturing space for magnetron tubes, missiles, radar and more. Raytheon retained ownership of the buildings until 1999 when they were purchased by a team of investment companies.

In 2010 the investors began a multi-year renovation of the buildings and surrounding area. The renovations included the demolition of outdated structures, construction of new entrance lobbies, common areas, and elevators, as well as upgrades to the infrastructure and landscaping. In 2010 Education Development Center, Inc. (EDC) moved its headquarters to the building becoming its largest tenant. Other notable current tenants include Workout World, Simpson Gumpertz & Heger Engineers, and Repligen Corporation.


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Having been used for research and development and heavy manufacturing by Raytheon, the buildings have extensive electrical capacity with built-in redundancy making it an ideal location for high-tech businesses requiring extensive, reliable power. The building features abundant parking for its tenants with roughly four spaces per 1,000 ft2 of space. In addition to modern, flexible state-of-the-art interiors, the buildings feature gorgeous outdoor space with ample benches, bicycle parking and areas for employees to enjoy breaks outdoors. Modern finishes for build outs include tech ceilings, hardwood or lacquer finished floors, sliding glass office doors and more.