Tresco is a heritage-listed residence located at 97 Elizabeth Bay Road, Elizabeth Bay, City of Sydney, New South Wales, Australia. It was designed by Thomas Rowe and built by Rowe from 1867 to 1883. The property is privately owned. It was added to the New South Wales State Heritage Register on 2 April 1999.^[1] The property has previously functioned as a private residence, navy housing, and homestead and was originally indigenous lands. Before 2004 it was owned by the Royal Australian Navy and served as an official residence for the senior naval officers in New South Wales.

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Tresco
Location	97 Elizabeth Bay Road, Elizabeth Bay, City of Sydney, New South Wales, Australia
Coordinates	33.8709°S 151.2306°E / -33.8709; 151.2306
Built	1867–1883
Built for	Thomas Rowe
Architect	Thomas Rowe
Architectural style(s)	Victorian Italianate
New South Wales Heritage Register
Official name	Tresco, grounds and trees
Type	State heritage (complex / group)
Designated	2 April 1999
Reference no.	780
Type	Villa
Category	Residential buildings (private)
Builders	Thomas Rowe
Location of Tresco in Sydney

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Elizabeth Bay had been the site of a fishing village established by Governor Macquarie in c. 1815 for a composite group of Cadigal people under the leadership of Bungaree (d.1830). Elizabeth Bay had been named in honour of Elizabeth Macquarie. Sir Thomas Brisbane, Governor 1821–25, designated Elizabeth Bay as the site of an asylum for the insane.^[1]

The site for Tresco formed part of the original 22-hectare (54-acre) property granted to the Honourable Alexander Macleay, Colonial Secretary of New South Wales, by Crown grant in 1831. In 1839 MacLeay constructed a stone mansion named Elizabeth Bay House on the property, as well as extensive stables, museums, and a large garden of interesting plants, specimen trees, an orchard and orangery. Financial trouble forced MacLeay to submit to the foreclosure of his mortgage to his son, William Sharp Macleay, in 1845. Upon William's death in 1865, the property passed to his brother, George, who returned to England.^[2][1]

MacLeay Point was subdivided in 1865 at the direction of George MacLeay. Allotments were sold on a leasehold basis, and a covenant placed over the deeds made it obligatory to build a substantial house to the value of A£500 within 5 years. In 1865 Thomas Rowe bid and secured lot 48 of the Elizabeth Bay Estate subdivision and was one of the first leaseholders to erect a building. Tresco was constructed by Rowe and completed in 1868. He resided there until 1876.^[1][3]: 16

The original house constructed by Rowe consisted of a two-storey sandstone house with a slate roof, comprising 13 rooms. There also included notable features such as a coach house, stables, and garden. The original design is described as early Victorian, with seven full-length windows and a small window on the first-floor landing. The entrance portico was Italianate style, an open verandah to the north-overlooking Elizabeth Bay, and a single-storey kitchen to the south.^[1][3]: 18

Rowe was born in England in 1829 and came to Australia in 1848. He commenced work as an architect in Sydney in 1856, previously working in the building industry. He was an alderman on the Sydney City Council and, later the first mayor of Manly. He founded the Institute of Architects in NSW and was president of the Metropolitan Board of Water Supply and Sewerage.^[1][3]: 22

The leasehold for Tresco passed to William Oswald Gilchrist in 1876, and then to George Charles Westgarth in 1880. Westgarth and his family resided at Tresco from 1880 to 1891. William was the first manager of the Australasian Steam Navigation Company. George's second wife was the granddaughter of Sir G. W. D. Allen, Lord Mayor of Sydney 1844–45, and several of his 8 children were born at Tresco, including the fourth son Dudley, who presented the original bill of the sale signed by his father in 1880. Westgarth was responsible for the only major additions and alterations to Tresco, which included the construction of an extensive east wing, and a second floor to the kitchen wing in 1883. He was also responsible for much of the garden design and layout, including the summerhouse, fernery, boathouse and boat pound.^[1][3]: 24

Westgarth was to reside at Tresco until 1891, after which time the house was let to various tenants. In 1902 the leasehold was conveyed to The Crown, and management of the property assigned to the New South Wales and Commonwealth governments.^[4] The house was provided to the Admiralty as the official residence of the Naval Officer-in-Command at Garden Island in Sydney.^[5] In 1913 the leasehold was transferred to The Commonwealth of Australia, however it was not until 1922 that the freehold was also acquired. From 1913 (and thus throughout World Wars I and II) Tresco was the official residence of the Flag Officer-in-Charge of the Royal Australian Navy.^[3]: 31 The property only underwent minor changes during the naval presence. Alterations included the reconfiguration of bedrooms to the main house, rooms to the south and garage, enclosure of the north verandah, and installation of plasterboard ceilings to the ground floor rooms of the main house.^[3]: 37 In 1988 the management of Tresco passed to the Defence Housing Authority, of the Department of Defence. Between 1991 and 1997 Tresco was substantially conserved and restored by conservation architects Otto Cserhalmi and Partners. The site works included, the stabilization of rock overhangs and retaining walls, and improvements to site drainage. Works to the house included repairs to the roof and stonewalls, the repair or reinstatement of many of the original internal finishes and fittings. New bathrooms were also installed at this time.^[1][3]: 45

In 1997 it was sold by the Federal Government to the Anstee family for $9 million and it last traded in 2004 when Janette and former art collector and options trader, David Waterhouse bought it. Since then it has had extensive work, bringing its interiors into the modern era, converting the stables into an office and cellar and adding a one-bedroom apartment above the garage.^[1][6]

As at 12 September 2008, Tresco has National significance for its role as the principal residence of the Captain-in-Charge of HMA Naval Establishments in Sydney from 1903 and as the residence of the Flag Officer-in-Charge of the Royal Australian Navy since 1913.^[1]

Tresco has State significance as a Victorian villa in the Italianate style which retains its architectural integrity as an intact and rare example of the fine residences that once characterised Macleay Point. It is significant as an example of craftsmanship and construction techniques used in the mid to late nineteenth century and recent conservation and restoration works (1991–1997). The house garden and waterfront structures make an important contribution to the character of the area, forming a prominent element in the landscape of Elizabeth Bay from the Harbour.^[1]

The property is associated with prominent Sydney architect Thomas Rowe and George Wesgarth. Rowe designed and constructed the original house in 1867 and Wesgarth was responsible for the only significant additions and alterations – the garden layout and landscape elements in 1883. It is also associated with George Macleay, who was responsible for the subdivision and James Macarthur-Onslow who held title until 1922. It is therefore one of the few surviving original land parcels created in the 1867 subdivision of the Elizabeth Bay Estate at Macleay point and for the unusual manner in which the estate was sold.^[1][3]

Tresco, grounds and trees was listed on the New South Wales State Heritage Register on 2 April 1999 having satisfied the following criteria.^[1]

The place is important in demonstrating the course, or pattern, of cultural or natural history in New South Wales.

Tresco is of State historical significance as one of the few surviving original land parcels created in the 1867 subdivision of the Elizabeth Bay Estate at MacLeay Point. Many of the other parcels were further subdivided in the 20th century, as a reflection of the high land values of the locality. This Estate was subdivided and sold on a leasehold basis, the freehold title being retained by James Macarthur-Onslow. This is thought to be an unusual form of real estate development for the period.^[1]

Tresco, its early gardens and features such as the Boat Pound, was one of the first buildings to be constructed after the 1867 subdivision, and survives intact as a rare example of the fine houses built on the subdivided land, most of which have subsequently been demolished. it is therefore one of the few properties in the locality which is able to demonstrate the nature of residential development on prime Harbour front land, as the original large estates were broken up in the later decades of the 19th century.^{[1][3]: 140}

The place has a strong or special association with a person, or group of persons, of importance of cultural or natural history of New South Wales's history.

Tresco is of State significance for its association with the prominent Sydney architect Thomas Rowe, initial leaseholder of the property, who designed and constructed the original building in 1867. Tresco is of State significance as the principal residence of the Captain-in-Charge of H.M.A. Naval establishments in Sydney from 1903, and as the residence of the Flag Officer-in-Charge of the Royal Australian Navy since 1913.^[1]

The place is important in demonstrating aesthetic characteristics and/or a high degree of creative or technical achievement in New South Wales.

Tresco has aesthetic significance at State level, as a large and impressive mid to late 19th century two storey sandstone villa, in the Victorian Italianate style, which retains its early architectural integrity. The aesthetic significance is reinforced by its prominent setting high on the ridgeline above a fine and extensive waterfront garden, which provides a superb outlook over the inner reaches of Sydney Harbour. The terraced garden makes an important contribution to the special character of the Elizabeth Bay area for its collection of mature trees, particularly the large Moreton Bay fig, early landscape layout, pathways, steps, garden details and waterfront structures.^{[1][3]: 140}

The place has a strong or special association with a particular community or cultural group in New South Wales for social, cultural or spiritual reasons.

The building has a high level of social significance for personnel of the Royal Australian Navy for its role as the principal residence of the Navy, and the official residence of the Flag Officer-in-Charge of the Royal Australian Navy.^[1]

The place has potential to yield information that will contribute to an understanding of the cultural or natural history of New South Wales.

Tresco has scientific significance for its ability to reveal the quality and complexity of 19th century joinery, plasterwork detailing and colour schemes, in addition to its general construction. While such construction is not unique in Sydney, Tresco is a fine example of craftsmanship and residential construction techniques used in the 19th century.^[1] The Boat Pound has scientific significance as a rare survivor, and for its ability t demonstrate construction techniques of late 19th century waterfront structures.^[1] Tresco, its outbuildings, gardens and landscape elements have scientific significance as good examples of conservation and restoration works undertaken in the late 20th century.^{[1][3]: 141}

The place possesses uncommon, rare or endangered aspects of the cultural or natural history of New South Wales.

Tresco has State historical significance as a rare surviving example of a fine Victorian villa with an intact curtilage and garden overlooking the Harbour from the upper ridge of MacLeay Point.^[1]

• Australian residential architectural styles