 Elizabeth Bay House's relationship with the villas "Tusculum" and "Rockwall", Potts Point provides a rare key precedent for town planning in Australia.The 1826 grant of Elizabeth Bay House estate to Alexander Macleay was followed by the granting of a series of allotments along Macleay Street Potts Point to the colony's principal civil servants and one respectable merchant, under a series of villa conditions, which specified the quality and elements of the design of these houses.It is believed that both Alexander Macleay and Mrs Darling, wife of the Governor, took a key role in establishing the parameters for this development of Sydney's first suburb.