Ikea is planning to build a 417,000 square foot store next to Dolphin Mall.: http://www.miamiherald.com/2012/08/22/2963592_ikea-coming-to-miami-dade.html
The store will be above a two level parking garage, which is unusual for Ikea.
The largest Ikea in the US is in Schaumburg, Illiniois at 450,000 sf. An Ikea in Centennial, Colorado which opened last year is said to be second largest at 415,000 sf.
The Swetwater store will be 40% larger than the Broward County Ikea in Sunrise which is 293,000 sf.