<Tr> <Th> Architect </Th> <Td> Pelli Clarke Pelli </Td> </Tr> <Tr> <Th> Website </Th> <Td> aria.com </Td> </Tr> <P> Aria Resort and Casino is a luxury resort and casino, part of the CityCenter complex on the Las Vegas Strip in Paradise, Nevada . Aria consists of two curved glass and steel highrise towers adjoined at the center . It opened on December 16, 2009 as a joint venture between MGM Resorts International and Infinity World Development . At 4,000,000 sq ft (370,000 m) and 600 ft (180 m) in height, it is the largest and tallest structure at CityCenter . </P> <P> The resort's 61 and 51 - story towers contain an American Automobile Association five diamond hotel with 4,004 guest rooms and suites, 16 restaurants, 10 bars and nightclubs, and a casino with 150,000 sq ft (14,000 m) of gaming space . It also has a 215,000 sq ft (20,000 m) pool area with 34 cabanas, an 80,000 sq ft (7,400 m) salon and spa, a 300,000 sq ft (28,000 m) convention center and a 1,800 - seat theater which hosted Zarkana by Cirque du Soleil, until closing April 30, 2016 . </P>

When was the aria built in las vegas