Landau was a supplier of oregon & redwood from his Annandale Timber and Moulding Co for several Seidler houses, including his own Landau House, Whale Beach, 1952. He was a major patron of Schulim Krimper and the owner of probably the largest collection of Krimper furniture, over 50 pieces commissioned mid-late 1950s. Important art collector whose house was a social centre for many European immigrants, artists and dealers.