What kind of difficulties or contradictions does the existence of old communities bring to urban renewal?

Jones Lang LaSalle believes that urban renewal is not the result of a temporary change or a change in a certain district. Urban renewal always needs to change from "point building renewal" to "whole area renewal", which requires the cooperation of all walks of life. The transformation of old communities is an important content of urban construction in China at present, and it is also an extremely complicated urban activity, which brings many difficulties to urban renewal. It has brought six major contradictions in the process of urban renewal and transformation. First, the contradiction between district reconstruction and urban functional planning; Second, the contradiction between cultural continuity and urban development; Third, the contradiction between the diversified needs of residents and the lack of external environment space; Fourth, the contradiction between the limited source of funds and the transformation effect; Fifth, the contradiction between single profit model and sustainable operation; Sixth, the interests of different participants are contradictory.