七十年代后期,城市旧住宅利用开始引起世界各国的重视。由于对城市更新的错误理解,随意把成片旧住宅拆除、盖起面貌全非的高密度的现代建筑的做法曾是一时风尚;而今它已成了历史的过去。惨痛的教训,使各国开始认识到保留一些有价值的旧住宅建筑,并对它们进行改善和更新,不仅关系到历史遗产、社会经济,而且也关系到旧城市改造的途径。 In the late 1970s, the use of urban old houses began to attract the attention of all countries in the world. Due to the misunderstanding of the urban renewal, the practice of dismantling the old residential buildings at random and building high-density modern buildings with a completely different appearance was once fashionable; now it has become the historical past. The painful lessons made countries recognize that the preservation of some valuable old residential buildings and their improvement and renewal are not only related to historical heritage and social economy, but also to the transformation of old cities.