Question: What state is the historic property that was formerly owned by the the naval branch of the Australian Defence Force located in?

Context paragraphs:
Royal Military College, Duntroon: The Royal Military College, Duntroon, is the Australian Army's officer training establishment.  It was founded at Duntroon, in the Australian Capital Territory, in 1911 and is located at the foot of Mount Pleasant near Lake Burley Griffin, close to the Department of Defence headquarters at Russell Hill.  Duntroon is adjacent to the Australian Defence Force Academy (ADFA), which is Australian Defence Force's tri-service military academy that provides military and tertiary academic education for junior officers of the Australian Army, Royal Australian Air Force and the Royal Australian Navy.

Australian Defence Basketball Association: The Australian Defence Force Basketball Association (ADFBA) formed in 1983, is an accredited Australian Defence Force sporting association under the auspices of the Australian Defence Force Sports Council (ADFSC).

Tresco, Elizabeth Bay: Tresco is an historic property located in Elizabeth Bay, New South Wales, Australia.  Until 2004, it was owned by the Royal Australian Navy and served as an official residence for the senior naval officers in New South Wales.  The house, grounds and trees have both federal and state heritage listings.

List of Australian military bases: The Australian Defence Force is made up of the Royal Australian Navy, Australian Army and the Royal Australian Air Force.  These three military services have numerous military bases situated in all the States and Territories of Australia.  Most of Australian Defence Force bases are equipped with Everyman's Welfare Service recreation centres.

Defence Long Service Medal: The Defence Long Service Medal is an Australian Military award given for long service by permanent and reserve members of the Australian Defence Force, irrespective of rank.  It was introduced in 1998, and replaced the suite of defence force service awards introduced in 1982, which comprised the Defence Force Service Medal, the Reserve Force Medal and the Reserve Force Decoration.

Australian Defence Force Cadets: The Australian Defence Force Cadets (ADFC) (Known as the Australian Service Cadet Scheme until 2001) comprises three Australian Defence Force affiliated community-based, youth development organisations of approximately 22,000 cadets and 2,200 cadet staff in 464 units and squadrons across Australia.  Coordination of the Australian Defence Force Cadets is via the ADF HQ unit called Reserve and Youth Division, with Commander ADF Cadets - directly accountable to VCDF.  The ADFC is funded by the Australian Government through the Department of Defence, in partnership with the community.

Defence Force Service Medal: The Defence Force Service Medal (DFSM) is an Australian Military award given for long service by permanent members of the Australian Defence Force.  It is part of the suite of defence force service awards introduced in 1982, which also included the Reserve Force Decoration (RFD, for officers of the Australian Defence Force Reserves) and the Reserve Force Medal (RFM, for non-commissioned members of the Reserve forces).  All three medals were replaced in 2002 with a single medal, the Defence Long Service Medal, which is now awarded to all permanent and reserve members irrespective of rank.

Australian Defence Medal: The Australian Defence Medal is an Australian military decoration which recognises current and former Australian Defence Force personnel who completed an initial enlistment period, or four years' service.  It was established on 20 March 2006; however, it recognises qualifying efficient service of current and former Australian Defence Force Regular and Reserve personnel, including National Servicemen, who have served since 3 September 1945.  It is estimated that up to one million current and ex-serving personnel are eligible for the award.  At 30 June 2010, a total of 242,576 had been awarded.

Australian Defence Force Investigative Service: The Australian Defence Force Investigative Service (ADFIS) is the body responsible for complex and major investigations involving the Australian Defence Force.  The ADFIS conducts investigations of serious incidents and breaches of the Defence Force Discipline Act involving persons subject to DFDA jurisdiction.  The ADFIS is a 'tri-service' unit and is manned by 150 members of the Royal Australian Navy, Australian Army and Royal Australian Air Force.  It was established in 2007 and is headquartered in Canberra.

Royal Australian Navy: The Royal Australian Navy (RAN) is the naval branch of the Australian Defence Force.  Following the Federation of Australia in 1901, the ships and resources of the separate colonial navies were integrated into a national force: the Commonwealth Naval Forces.  Originally intended for local defence, the navy was granted the title of 'Royal Australian Navy' in 1911, and became increasingly responsible for defence of the region.

Supporting paragraphs: Tresco, Elizabeth Bay Royal Australian Navy
Answer: New South Wales