Cassidy Turley today announced a 33,669-square-foot lease on behalf of Mimecast at 480 Pleasant Street in Watertown. Mimecast, which uses a cloud-computing platform to manage corporate email accounts, is relocating from its 17,300-square-foot office at the Waltham Watch Factory site to the former Boston Scientific complex in Watertown. The new location will serve as Mimecast’s North American headquarters. With the move, the company’s footprint will increase by nearly 95 percent.

“After a thorough evaluation of the market, Mimecast felt the original brick-and-beam architecture of this new space matches the originality of our business, which was the first of its kind to offer a complete email management package,” said Mark Bilbe, General Manager of Mimecast North America. “This new location will enable us to continue to recruit Boston’s top talent and grow our company for many years to come.”

Located on the Charles River, Mimecast’s new site, known as the Riverworks, was purchased in 2010 by Farley White. The converted mill buildings were recently renovated to include features such as a cafeteria, a fitness center and a courtyard with outdoor seating.

Senior Managing Director, Principal Brian Hines and Associate Ryan Romano of Cassidy Turley represented Mimecast in the transaction. Vice President Daniel Kollar of Jones Lang LaSalle represented the landlord, Farley White.

“We were pleased to help Mimecast find a new space where its employees can develop new ideas and reach their potential,” said Hines. “The site’s Watertown location, which boasts close proximity to Boston, Cambridge and the Route 128 corridor, is a perfect fit for technology companies like Mimecast.”