The Wildlife Sanctuary, located along Delafield Place and west of Elba Road, was acquired through a land trade with Fairfax County in 1976. This level, 2.3-acre tract was subdivided for development in the 1960s, but never improved, possibly because of its environmental sensitivity. 

Not far from the Wildlife Sanctuary is a different, 2.42-acre parcel of land, located to the southwest of the 7800 block of Elba Road. It was originally included in the plats of Hollin Hills and dedicated for public use by Robert Davenport. However, this parcel was purchased by the Fairfax County Park Authority in 1999 and is no longer owned by the Civic Association of Hollin Hills.