The colonial Birling and Maryland estates are situated south-west of Sydney: a region undergoing profound change as agricultural land is rezoned for urban development. HAA was asked by Camden Council and the Heritage Office to study the implications of the rezoning on two historic homesteads and their land, set in the area known as Lowes Creek.

The resulting study was undertaken within the anticipated rezoning. It devised a suite of policies to conserve the heritage significance of both the historic buildings and their landscapes as whole estates, rather, rather than remnant homesteads.

The policies deal properly with the fabric of the buildings, their uses, interpretation, and particularly with their management and the control of intervention. Most importantly, policies are proposed addressing development so that the landscape of the estates remain completely legible.