Question: What upper mountain centre is adjacent to the town that boasts itself as the location of  Everglades Gardens property?

Context paragraphs:
Ueyama: Ueyama (written: 上山 lit.  "upper mountain") is a Japanese surname.  Notable people with the surname include:

New Jersey Brigade Encampment Site: The New Jersey Brigade Encampment Site, also called the New Jersey Brigade Area, was used by the Continental Army in the winter of 1779–80, during the American Revolutionary War.  The site is located in Bernardsville, Somerset County, New Jersey and extends into Harding Township, Morris County.  About 1,300 men of the New Jersey Brigade were encamped here.  It is one of four contributing sites of the Morristown National Historical Park.  The Cross Estate Gardens property was added in 1975.

Everglades Gardens: The Everglades Gardens are a historic property in Leura, New South Wales, owned by the National Trust of Australia.

Mountain Avenue station: Mountain Avenue is a New Jersey Transit station in Montclair in Essex County, New Jersey, United States, along the Montclair-Boonton Line.  The station is located on Upper Mountain Avenue, which gives the station its name.

Brecon Beacons Mountain Centre: The Brecon Beacons Mountain Centre is the popular name for the National Park Visitor Centre managed by the Brecon Beacons National Park Authority.  It is also known simply as the Mountain Centre, and also as the Libanus Visitor Centre.  It is situated near the village of Libanus some 8 km / 5 mi south-west of Brecon in the county of Powys, south Wales.  The Centre provides information and interpretation for visitors to the area.

Presby Memorial Iris Gardens: Presby Memorial Iris Gardens is a nonprofit, volunteer-run living museum specializing in iris flowers, located at 474 Upper Mountain Avenue, Montclair in Essex County, New Jersey, New Jersey, United States.  The gardens are situated on 6.5 acres.  Adjacent to the gardens is a Victorian house, the Walther House.  The house is open to the public and is home to a museum shop and headquarters for the Citizens Committee that oversees the gardens.

Berghaus: Berghaus Limited is an outdoor clothing and equipment manufacturer headquartered in Sunderland, Tyne & Wear, UK.  It is based in the North East of England but distributes worldwide.  It was founded in 1966 by climbers and mountaineers Peter Lockey and Gordon Davison, initially as an importer and distributor of outdoors products.  Lockey and Davison's outdoor store in Newcastle-upon-Tyne, UK, went by the name of the LD Mountain Centre.  In 1972 they began designing and manufacturing their own products for sale in their shop.  They called their brand 'Berghaus' which is a literal translation of 'mountain house' in German.

Plas y Brenin: Plas y Brenin located in Conwy County Borough, Wales is the National Mountain Centre for the United Kingdom.  The centre is situated in Dyffryn Mymbyr, the Mymbyr Valley, in Snowdonia and is less than a quarter of a mile south-west of the centre of Capel Curig on the A4086 road.

Moel Siabod: Moel Siabod is a mountain in Snowdonia, North Wales, which sits isolated above the villages of Betws-y-Coed and Capel Curig.  At 872m it is the highest peak in the Moelwynion mountain range.  The UK National Mountain Centre, Plas-y-Brenin, is located at the foot of Moel Siabod.  From the top of the mountain, it is reputedly possible to see 13 of the 14 highest peaks in Wales on a clear day without turning one's head.

Leura, New South Wales: Leura (postcode: 2780) is a suburb in the City of Blue Mountains local government area that is located 100 km west of the Sydney central business district in New South Wales, Australia.  It is one of the series of small towns stretched along the Main Western railway line and Great Western Highway that bisects the Blue Mountains National Park.  Leura is situated adjacent to Katoomba, the largest centre in the upper mountains, and the two towns merge along Leura's western edge.

Supporting paragraphs: Everglades Gardens Leura, New South Wales
Answer: Katoomba