The Agri-Mark dairy cooperative is purchasing the former Northern Power Systems building in the Mad River Park in Waitsfield and will move its 115 employees to the site in the fall.

The building has been empty since Northern Power Systems left Waitsfield in 2010. Ownership of the 31,000-square-foot building reverted to the Central Vermont Economic Development Corporation, from whom Agri-Mark will purchase it.

Doug DiMento, director of communications for Agri-Mark, said that the co-op’s employees are cramped in their current Montpelier offices and very much in need of more space.

Agri-Mark will be using 22,000 square feet of the building and will become the landlord for two tenants who are leasing 9,000 square feet through 2016.