2013 Statement of Heritage Impact for Demolition of Rangers Cottage, Illawong Bay, Ku-ring-gai Chase National Park This cottage was constructed to accommodate Rangers in the extended national park in the mid 20th century. ArchitecturalLocalLandscapeSydney - NorthernHeritage Assessment Authors: Dr Sue Rosen and Mr Martin Pickrell Client: National Parks and Wildlife Service, Northern Region. Office of Environment and Heritage This Heritage Impact Assessment forms part of the approval process for the proposed demolition of the Rangers Cottage located above the picnic area at Illawong Bay and believed to have been constructed in the 1950's or 1960's.