We have a couple you might be thinking of. Daveco liquors is the biggest at 102,000 sq. ft. of floor space. It has been certified by the Guinness Book of World Records as the largest liquor store in the world.
Other large liquor stores in the Denver area include:
Tipsy's Liquor World, it comes in at 87,000 sq. ft.
Davidson Liquor is about 50,000 sq. ft.
Applejack is pretty big, around 40,000.
Total Beverage Westminster and Argonaut are a little smaller at a bit over 25,000 sq. ft.