There are thousands of abandoned big box stores sitting empty all over America, including hundreds of former Walmart stores. With each store taking up enough space for 2.5 football fields, Walmart’s use of more than 698 million square feet of land in the U.S. is one of its biggest environmental impacts. But at least one of those buildings has been transformed into something arguably much more useful: the nation’s largest library.

Meyer, Scherer & Rockcastle transformed an abandoned Walmart in McAllen, Texas, into a 124,500-square-foot public library, the largest single-floor public library in the United States.

The design won the International Interior Design Association’s 2012 Library Interior Design Competition. MSR stripped out the old ceiling and walls of the building, gave the perimeter walls and bare warehouse ceiling a coat of white paint, and set to work adding glass-enclosed spaces, bright architectural details and row after row of books.

The library even has an acoustically separated lounge for teens as well as 6 teen computer labs, 16 public meeting spaces, 14 public study rooms, 64 computer labs, 10 children’s computer labs and 2 genealogy computer labs. Other new features include self check-out units, an auditorium, an art gallery, a used bookstore and a cafe.

While you can still see hints of what the library once was in its sprawling shape and industrial ceilings, it seems like an entirely new space. According to PSFK, the library saw new user registration rise by 23% within the first month following the new library’s opening.