The most interesting architectural phenomenon of the 1970's was the enthusiasm for refurnishing older building. Obviously, this was not an entirely new phenomenon. What is new is the whole scale in reusing the past, in recycling, in adaptive rehabilitation (更新 ). A few trial efforts, such as Ghirardelli Square in San Francisco, proved their financial feasibility in the 1960's, but it was in the 1970's, with strong government support through tax incentives and rapid depreciation (贬值) , as well as growing interest in ecology (生态) issues, that recycling became a major factor on the urban scene. One of the most comprehensive ventures was the restoration and transformation of Boston's eighteenth century Faneuil Hall and the Quincy Market, designed in 1824. This section had fallen on hard times, but beginning with the construction of a new city hall immediately nearby, it has returned to life with the intelligent reuse of these fine old buildings under the design leadership of Benjamin Thompson. He has provided a marvelous setting for dining, shopping, professional office, and simply walking.