Question: Who operates the shopping centre where The Arcadia Hotel was formerly located?

Context paragraphs:
Dolman Theatre: The Dolman Theatre is located in the city of Newport, Wales, United Kingdom.  The theatre was formally an integral part of Kingsway Shopping Centre until major restructuring of the shopping centre forced what was the main entrance of the theatre (from inside the shopping centre itself) to be closed; the theatre was refurbished in 2005, with what was the main entrance from inside the shopping centre becoming a single-door emergency exit into Kingsway Shopping Centre; along with this change the side of the theatre facing onto Emlyn Square Road was drastically rebuilt with a new glass frontage and redesigned box office and foyer-bar area to match the rest of the renovations also (and still) in progress throughout the city.

Arcadia Hotel, Sydney: The Arcadia Hotel was a 150-room hotel in Sydney, Australia, developed by James Joynton Smith, on the site occupied today by Westfield Sydney.

Chirnside Park Shopping Centre: Chirnside Park Shopping Centre is a suburban shopping centre, located in Chirnside Park, Melbourne, Australia and is owned by GPT Wholesale Shopping Centre Fund.  It is situated approximately 32 kilometres east-north-east of the Melbourne CBD.  The shopping centre opened in 1979 as a small convenience shopping centre which has grown over the years, opening businesses such as Kmart, Target, Woolworths, Coles and Reading Cinemas.

Athlone Town Centre: Athlone Towncentre is a shopping centre located in Athlone, County Westmeath, Ireland.  The shopping centre is the largest shopping centre in the Irish midlands with over 140,000 sq meters of retail space consisting of 60 high end retail shops.  The Shopping centre is located in the heart of Athlone town enclosing a site on Dublin Gate Street and Gleeson Street.  The Shopping Centre opened in 2007.  The 4 star Sheraton Hotel adjoins the site and consists of 161 beds.  Anchor tenants include Marks and Spencer, River Island, Tommy Hilfiger, Topshop, Next, H&M, Monsoon amongst many more.

The Liberty: The Liberty is a covered shopping centre located in the London Borough of Havering.  It is the largest shopping centre in Romford.  It was originally built in 1968 as the Liberty Shopping Centre and underwent a four-year redevelopment completed in 2004.  The centre takes its name from the former Liberty of Havering and is owned by the Cosgrave Property Group.  It is the largest indoor shopping centre in the borough and covers 730000 sqm with 36400 sqm of retail space, around 100 shops.  The Liberty has an annual footfall of 23 million, equating to 425,000 people per week.  It is linked to Mercury Shopping Centre (formerly Liberty 2) by an underpass.

Lavington Square Shopping Centre: Lavington Square Shopping Centre opened in 1979 in the Albury suburb of Lavington, New South Wales, Australia.  Since opening the shopping centre has undergone several upgrades and name changes the most major upgrades to the centre were done after Centro bought the shopping centre in 1994.  The shopping centre currently has 57 specialty retailers and 3 major retailers including Woolworths, BIG W and Aldi.  The shopping centre also houses the lavington Australia Post branch for the post code of 2641.  In 2013, the centre's revenue was $116 million.

Cairns Central: Cairns Central Shopping Centre in north Queensland, Australia is Cairns' biggest shopping centre.  The centre was opened in late 1997 and is the second multi-story shopping centre in northern Queensland.  The shopping centre is built over the Cairns Railway Station, which is incorporated with the centre.  Pedestrian access to the station is through the car park on the bottom floor, or a pedestrian walkway on the second floor.  Construction of the shopping centre was delayed temporarily due to damage suffered from Tropical Cyclone Justin in early 1997.

Specialists' Shopping Centre: The Specialists' Shopping Centre () was the oldest shopping centre on Orchard Road, a shopping area of Singapore.  The mall was originally named Specialists due to the concentration of medical specialists in its early days.  It was constructed in the early to mid-1970s.  The largest tenant was the Hotel Phoenix Singapore and John Little.  The Visitor's Guide of Singapore described the shopping centre as "revered".  However, the Specialists' Shopping Centre along with the Hotel Phoenix Singapore had been demolished to make way for newer developments in 2008.

Westfield Sydney: Westfield Sydney is a shopping centre operated by Scentre Group and located beneath the Sydney Tower in the Sydney central business district.  It is located on Pitt Street Mall and is adjacent to the Mid City Centre, The Strand Arcade and Stockland Glasshouse.

Elmvale Acres Shopping Centre: Elmvale Acres Shopping Centre is an open-air mall located in the Elmvale Acres neighbourhood of Ottawa, Ontario, Canada.  It opened in 1961, making it one of the oldest shopping centres in the city.  The mall is just a short 10-minute drive south of St. Laurent Shopping Centre.  The shopping centre is also just a 3-minute drive from the Canadian Museum of Science of Technology (closed until 2017).  The Smythe Medical Centre is located just across from the north end of the mall.  The mall is bounded by Smythe Road to the north, Othello Avenue to the west, Russell Road to the east, and St. Laurent Boulevard to the south.  The shopping centre has approximately 60 shops and services including Dollar Plus, LCBO, Loblaws, Rexall Pharma Plus, Royal Bank, The Beer Store, and the Ottawa Public Library.  The shopping centre is adjacent to the Elmvale Transit Station.  The size of the total complex is 147,332 square feet.  The shopping centre is currently owned by Rio-Can Real Estate Investment Trust.

Supporting paragraphs: Arcadia Hotel, Sydney Westfield Sydney
Answer: Scentre Group