It includes one of the state's grandest Colonial Revival mansion houses (built 1894), and surviving outbuildings of a model farm of the turn of the 20th century.

Brook Farm is located on 45 acres (18 ha) in rural northwestern Cavendish, with its complex of buildings set on the west side of Twenty Mile Stream Road.

The property includes rolling fields separated by rows of trees and stone walls, and overlooks Twenty Mile Stream to the east.

The main house is a rectangular 2+1⁄2-story wood-frame structure, set on a stone foundation, with extensions in the shape of a backwards L on the west side.

Bates transformed the property into a model farm, and moved the original farmstead to another location in order to build the mansion house that stands today.