what does "the Del-Tex Building" stand for?
【Certainly the lines of onlookers were thinner around the Book Depository than in the shopping district. Nevertheless it was a large gathering for the neighborhood. Abraham Zapruder's secretary, looking down from the Dal-Tex Building, was impressed by the number of people crowding the curbs and shouldering their way to the edge of the plaza grass. 】

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The Dal-Tex Building is a seven story office building located at 501 Elm Street in the West End Historic District of downtown Dallas, Texas. The building is located on the northeast corner of Elm and North Houston Streets, across the street from the Texas School Book Depository in Dealey Plaza, the scene of the assassination of President John F. Kennedy on November 22, 1963.