By John Dieckmann For the past 30 years, the 28-acre former UMass Field Station at 240 Beaver Street in Waltham has hosted the Waltham Fields Community Farm and several other nonprofit organizations. The property includes an office building, a boiler house, greenhouses, and sheds. Ownership has recently transferred to the city of Waltham, and as a result, significant change may be in the offing. History of the UMass Field Station The property is a portion of the 200-acre, mid-nineteenth century Cedar Hill estate that was owned by a successful business man named Samuel Dennis Warren, the namesake of the S. [READ MORE]