Planning in New York, a world city, is complicated, fragmented, layered, and project-oriented. The imperatives of a metropolis often dash with the goals of neighborhoods. The planning commission, working within a highly structured and legalistic environment, promotes compromise, balances the needs of different groups, and mediates conflicts, while ensuring that major projects get built. Case studies of Donald Trump's Riverside South, the United States Tennis Association's National Tennis Center and others illustrate the nature of large city planning. They also give rise to a set of governing principles.