From the Waltham paper –
Waltham is on its way to making real estate history this year with the acquisition of the much-desired, nearly 200-acre parcel of land known as the Walter E. Fernald Center.
The Fernald property, at 200 Trapelo Road, is the largest piece of available land inside the Rte. 128 corridor and the state has offered to sell it to the city for $3.7 million
http://waltham.wickedlocal.com/article/20140506/NEWS/140507811
It sounds to me like a better price than Medfield got for 134 acres. However, the state priced the lands based on what it had spent on them, not on their value.