Law developed his Briarcliff Manor property primarily as a corporation until 1907 when, due to rising property values and falling agricultural development in Westchester County, he purchased twelve farms—totaling 3249 acres —for Briarcliff Farms on both sides of the Pine Plains-Stanford Road (present-day New York State Route 82) in Pine Plains and began developing his Briarcliff Manor properties for houses, churches and schools.