In 1988 Kiley was invited to work on the North Carolina National Bank plaza in Tampa, later known as NationsBank. Landscape architect Dan Kiley and architect Harry Wolf worked together to provide a harmonious plan for the NCNB headquarters building and the surrounding plaza. The design is based on the fibonacci mathematical sequence which Kiley used to determine the plaza’s checkerboard pattern of grass, concrete panels, and water features. Tree types and their placement were based on height also in relation to the fibonacci sequence. The tower and plaza opened in 1988, and the plaza was quickly praised as one of Kiley’s master works. The NationsBank tower designed by Harry Wolf is one of the most iconic structures in Tampa.