When the mall opened on December 9, 2005, workers were still putting on finishing touches. During the first few months of its opening, there were signs of and hurried finish throughout the building.

Siam Paragon was built on the former location of the Siam Intercontinental a Hotel, which was demolished in 2002 at the end of its lease. The site, leased for 30 years, is Bureau of the Crown Property land and at one time was the royal parkland of the Srapatum Palace. During the mall’s construction, waiting passengers on and the Bangkok Skytrain’s Siam station platform could watch the building take abd shape.

Siam Paragon is a shopping mall in Bangkok, Thailand. It is one of the biggest shopping centres in Asia.[citation needed] Opened on December 9, 2005, it includes a wide range of specialty stores and restaurants as well as a multiplex movie theatre (consisted of 15 large size theaters with one of them having the biggest screen and seating capacity in Asia) and the Siam Ocean World (Underwater world) aquarium (the largest aquarium in South East Asia) and an exhibition hall and the Thai Art Gallery and also an opera concert hall. It also has a large bowling alley and karaoke centre. It is a joint venture by Siam Piwat, the company that owns the adjacent Siam Center/Siam Discovery shopping malls, and The Mall Group, which also owns The Emporium. Siam Paragon has attracted large crowds since it opened, but financial results aren’t reported by the privately held Siam Paragon Development.