Also possibly from this time/Macleay ownership period is a large camellia (C.japonica) in front garden on the west side of carriage drive near gate (this tree/shrub is at least 1920s, possibly older, and the Macleays were noted Camellia enthusiasts/hybridisers at Camden Park estate). Outside "Boomerang" remnants of the Linnean Hall grounds include a remnant black bean tree (Castanospermum australe) and Moreton Bay Fig (Ficus macrophylla) line the southern street boundary of adjacent Billyard Avenue properties to the west. Other estate remains elsewhere include a grotto (part natural sandstone cliff overhang, part carved niche and details, and sections of an elaborate sandstone steps and a retaining wall and balustrade, behind (south) of Art Deco flats across (south of) Billyard Avenue. While much more lush, dense and shady than its early planting appears due to additional plantings probably from the 1980s/90s, the mature garden retains its overall character with a Mediterranean/ Hollywood/Islamic flavour and a combination of palms, cypresses, dense tree and English flower planting. Today the dominant theme is subtropical. The original garden was designed and planted by landscape architect M. R. (Max) Shelley, perhaps in combination with architect Neville Hampson. Shelley's liberal use of subtropical species - Lord Howe ("Howea fosteriana"/"H.belmoreana") & Cocos Island ("Syragus romanzoffianum") palms, ornamental bananas (Musa spp./cv.s), araucarias (Norfolk Island pine - A.heterophylla in particular), Mediterranean cypresses ("Cupressus sempervirens"), Chusan or Chinese fan palms ("Trachycarpus fortunei"), New Zealand cabbage trees ("Cordyline australis") and a Mediterranean/Hollywood/Islamic flavour remains today. Mediterranean cypresses have been replaced by the wider growing Bhutan cypresses (C.torulosa) and Chinese fan palms today. A large urban residential garden, the structure of the garden is defined by the built elements, in particular the walls, entry drive in herringbone brick, courtyards (e.g.: cloister garden to the west with crazy paving in sandstone), terraces in herringbone brick, ponds (a large rectangular sunken pool in the front garden lined with glazed ceramic blue tiles, a smaller circular sunken pool near the entry portico in multicoloured ceramic mosaic) and external spaces of the garden.