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The ship 's ballast stones cover more than 6,000 square feet of the channel bottom , which is scoured of sediments due to a steady movement of water that nourishes an abundance of hard and soft coral colonies that grow on the ballast stones . Toilet rooms must have a window not less than 6 square feet in area opening directly to the outside area or otherwise be satisfactorily ventilated . The measure , approved on a 5-3 vote , prohibits stores of more than 90,000 square feet that use 10 percent of space to sell groceries and other merchandise that is not subject to sales tax . The findings could contribute to the debate over a proposed city ordinance that would require big stores with more than 90,000 square feet to pay workers $ 10 an hour and $ 3 an hour in benefits by 2010 . Universal Building Program , which outlines the spatial relationships within a library , the Library has determined that it is inefficient to operate a library that is smaller than 30,000 square feet on more than one floor . Beyond the building 's curving copper facade , Venetian plaster walls and Great Reading Room of 43,000 square feet , lies a bathroom with some very stellar features .