Although the idea of a rooftop garden is not new, it is becoming a solution for both architects and city planners in addressing sustainability concerns. Their popularity is not just new buildings, but old buildings as well, the greening of the City Hall roof in Chicago a good example of the latter. In these "green" instances, practical issues (weight, irrigation, drainage, etc.) tend to take precedence over design. When accessible and highly visible, though, a rooftop's design should ideally synthesize the architecture with the raised landscape - and vice-versa - to create a satisfying environment that becomes an oasis in the city.

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50 Avenue Montaigne.........Paris, France