Siam Paragon was built on the former location of the Siam Intercontinental Hotel, which was torn down 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 the Bangkok Skytrain's Siam station platform could watch the building take shape. Now the Siam station platform has one of the best views of the mall's raised courtyard, where many expositions and events are held.
Often people will purchase a one-station trip ticket (with which they can leave the same station from where they purchased the ticket) simply to watch performances or other happenings on the courtyard.
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 a hurried finish throughout the building, with unpainted ceilings and cracked floor tiles.
It was built at a cost of about 15 billion baht or 450 million US$ and covers an area of 52 rai (8.3 ha, 21 acres).
- BTS Skytrain Sukhumvit Line and Silom Line – Siam station has a skybridge linked to Siam Paragon's M floor.
- Parking – 100,000 square meters, accommodating 4,000 cars.