Two years after acquiring the property for $12 million, Brookwood Financial Partners of Beverly has sold One Alewife Center in Cambridge to James Campbell Co. of Hawaii for $21.6 million.

Since Brookwood bought the 90,000-square-foot building in June 2012, occupancy has increased from 53 percent to more than 91 percent. A major capital improvement plan included upgrades to the lobby, café and common areas and replacement of the HVAC system and roof.

"The investments we made were well received in the market, and when coupled with the property’s exceptional location next to the MBTA’s Alewife stop, accelerated our ability to lease the vacant space," Thomas Brown, director of acquisitions for Brookwood, said in a statement.

Colony Realty Partners advised James Campbell Co. and Cushman and Wakefield represented Brookwood Financial.

"Some of the region’s most successful companies have either a headquarters or a significant presence in West Cambridge," Cushman & Wakefield Executive Director Matt Pullen said in a statement. "This presence, paired with growing amenities and a number of mixed-use developments currently underway, including 1,400 new residential units, makes West Cambridge the area’s newest live-work-play market."

Cushman & Wakefield’s Juliette Reiter, Mark Winters and David Townsend have been retained for future leasing activity.