sentences:  Wright's original plan for an adjoining tower, artists' studios and apartments went unrealized, largely for financial reasons.However, as part of the restoration, architects Gwathmey Siegel and Associates analyzed Wright's original sketches to design the rectangular 10-story limestone tower, that stands behind, and taller than, the original spiral building (replacing a much smaller structure), which has four additional exhibition galleries with flat walls that are "more appropriate for the display of art.