From Wikipedia: http://en.wikipedia.org/wiki/Texas_School_Book_Depository "The Texas School Book Depository (now the Dallas County Administration Building) is the former name of a seven-floor building facing Dealey Plaza in Dallas, Texas (U.S.). Located on the northwest corner of Elm and North Houston Streets, at the western end of downtown Dallas, its address is 411 Elm Street. The building is notable for its connection to the assassination of U.S.President John F. Kennedy. According to three United States government investigations,[1] an employee in the building, Lee Harvey Oswald, fatally shot the president from a sixth floor window on the southeast corner. The case, however, was never adjudicated in the jurisdiction in which it occurred, owing in part to the death of the accused assassin. The structure is a Recorded Texas Historic Landmark."

It must be a storehouse for books.