Hartwood consists of a stately Tudor mansion (begun in 1927 and completed in 1929), an English style Formal Garden, a cottage, a stable complex, and a gate lodge (erected in 1927).

The mansion, designed by Alfred Hopkins for John and Mary Flinn Lawrence, houses a collection of original English and American antiques.

Hartwood is sited 10 miles (16 km) northeast of Downtown Pittsburgh on largely forested land in both Hampton and Indiana townships.

Mary transformed the grounds of her estate into an equestrian arts showcase, building riding trails that extend for miles, show rings, steeplechase layouts, and ivy-covered stables.

[2] The pilot episode for the cancelled Twentieth Century Fox Television adaptation of Joe Hill's Eisner Award-winning graphic novel, Locke & Key, was filmed at the Hartwood Mansion in early 2011.