I remember the prefab estates in Knowle West in Bristol, many years ago. They had the reputation of a "bad area"
Prefabs ('Plattenbau') were also very common in East Germany (DDR) and they also have a negative "after-taste" these days. Whole blocks of flats were built in this manner. west Germany was very disparaging about the DDR 'plattenbau' flats and estates, but they used prefabs too
I've found a Wiki articles about the DDR prefabs:
https://en.wikipedia.org/wiki/PlattenbauDriving through the East German countryside it was sometimes a shock to see a single 10 storey Plattenbau in the middle of a small village, but - it was cheap housing, and that was what was needed !
While many plattenbau apartments have been renovated to a high standard, some are being torn down, although a lack of funds means many have been left to become derelict. Because of the modular construction some are dismantled and moved to a new location.
I like that last line ! Move a block of flats to a new location

and another site about prefabs in general:
https://en.wikipedia.org/wiki/Prefabricated_buildingwith a nice little animated construction view
Bob