Business

Athenahealth set to unveil its master plan for Arsenal on the Charles campus in Watertown

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The owner of a 29-acre cluster of brick buildings that stored gunpowder in the 1830s, built cannons for World War I, and housed an Army materials lab in the 1950s, wants to reinvent the site as a 21st-century hub where innovators come to work and play.

Health care software maker athenahealth Inc., which bought the Arsenal on the Charles for $168.5 million, has invited Governor Deval Patrick and other state and local officials to the nearly 200-year-old campus Wednesday to unveil a plan to transform it into New England’s answer to Silicon Valley’s signature technology office parks such as the Googleplex.

Among the site’s features, the company envisions about 150,00o square feet of new office space for athenahealth and other businesses.

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