Top 10 The Biggest, Largest and Longest in the world

WORLD'S BIGGESTOFFICECOMPLE X. CHICAGOChicago Merchandise Mart..... Illinois , USAThe Merchandise Mart is the world’s largest commercial building, largest wholesale design center and one of Chicago’s premier international business locations. Encompassing 4.2 million gross square feet, The Mart spans two city blocks and rises 25 stories. Today, The Merchandise Mart welcomes more than