Cornerstone is a subdivision of approximately 85 detached, single family homes built ca. 1988-1992; median age is ca. 1989. Interior living space ranges from approximately 3,300-4,900 sq. ft. with a median of approximately 3,400 sq. ft. Median lot size is approximately two-fifths of an acre.
Entry into the subdivision is from South Bryn Mawr Avenue onto Stone Creek Lane.
School District: Radnor Township