The mansion's grounds, bordered by Ashbourne Road, Spring Avenue and Cedar Lane, are surrounded by their original wrought-iron fencing and gates with stone base and pillars, in marked contrast to that of nearby Trumbauer contemporary Whitemarsh Hall whose similar fencing (which encompassed a much greater acreage) was sacrificed for wartime scrap and rapid postwar development. A gatehouse and another staff outbuilding, of the same materials as Lynnewood, also still exist within the fence. The property within the fence has remained contiguous, never having been subdivided.