The southern part of The Domain was not set aside as a public park until 1810. As soon as he arrived in 1810, Bligh's successor Governor Macquarie built stone walls around the Government House garden and the Government Domain, separating them from Hyde Park. The traditional foundation date of the Botanic Gardens is taken as the date of completion of Mrs Macquarie's Road, on 13 June 1816. By 1817 the Domain was completely enclosed and the road system completed including several gates to regulate horse-drawn traffic. The Domain itself was cleared of trees and opened as a public area in the 1830s. Eventually, the Inner Domain, the area closest to Government House, was entirely consumed by the Government Gardens while the area now known as the Domain was then the Outer Domain. Macquarie improved the garden, building a protecting wall on the harbour side and constructing and landscaping a road running around The Domain, north of the Government gardens/nursery at some distance from the shore, and bridging over Farm Cove Creek to Mrs Macquarie's Chair on Mrs Macquarie's Point in the east. Swamp mahogany ("Eucalyptus robusta") trees were planted to line this road, perhaps the earliest "Street trees" planted in the colony. Another 1813-1816 planting was of the black booyong ("Heritiera actinophylla") west of the palm grove, which remains. On the completion of these works the area was officially inaugurated as a Botanic Garden in 1816. In 1821 the Government House stables (now the Conservatorium of Music), designed by Government Architect Francis Greenway, was completed in The Domain's north near Macquarie and Bridge Streets.