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Do you mean in terms of its state of maintenance or its overall shape? What you often find, despite external appearances, is that people who live there can be very attached to these older builds. I mean, I criticise things like that architecturally quite often; for instance, I don't like open walkway estates, but then you meet people who say they like precisely that aspect (sometimes because for them it still represents progress, e.g. 'streets in the sky'. Plus, of course, people often know each other there well, and the most important thing for them can be the community and not how the place is built.
News on the long-running Earl's Court (well, next door to it) affair:
https://www.standard.co.uk/news/london/earls-court-resident-victory-housing-estates-under-threat-of-demolition-handed-back-to-council-a4289941.html
That land is worth a bomb. Tory council flogs it well under value, complete with (by today's standards, very low-density) estates on it, change of power at the Council, Labour negotiates to buy it back. I imagine they may have had leverage because there may have been problems with the original deal, but I have no knowledge of the case.