"For the last 150 years modern parks have been used as a compensation for the stress of living in cities. Environments devoted to production can be ugly and polluting, while those devoted to consumption, in contrast, are idealized landscapes like gardens and parks. In the ub park have had ' u dis inct e ressions: the pleasure ground (1850-1900), the fa i ity '1 930-1965), and the open space system (19651 1 in ark thinking introduced a more artistic vision of Up 1 0 r t S ic s efo m park "1 9 _' 930) . the recreation c rep . The er of he op n spa sy te j es ct t) - t c tse t e g e v ew ce s 0 g ect and consonant with that, sculptors and he y he ity i if b in i ed a an art other gallery artists began to do more work in the public realm. Landscape architects, sculptors and architects have formed an uneasy alliance around percent for art allocations in major public buildings. What has been missing but is on the horizon is the integration of ecology with these three other fields. I predict that the fifth model will express principles of sustainable development and mark a fundamental change in the old counterpoint between park and city. Sustainable development means providing for our present needs without imposing costs of the future. This paper describes the preliminary planning process for sustainable urban development of 23 acres of park and 8.3 million square feet of buildings on Manhattan's Upper West Side. The developer (Trump) offered the park to the City in exchange for the right to build at high density, continuing the traditional function of the park as a compensation for living in cities. Instead, as a member of the team assembled to critique the proposal, the author has proposed that the park be used as a partner in sustainable development. Thus, building which has traditionally been anathema to park theorists might be appropriate in a park if it helped the new buildings recycle their solid waste or sewage. This is a report on an in-progress evolution of a new king of cityscape, with parallels and contrasts noted with Parc La Villette in Paris, the canal district of Mexico City, and public art in Barcelona, Spain."