Slightly related, but when communists came to power in my Eastern-European country immediately after WW2 they nationalized most of the urban “big” houses and apartment-blocks. Most of the owners of those properties had to move out completely, but some of them still had the “opportunity” to still live inside a room of their now former property and the rest of the rooms were given as rentals to workers who had come mostly from the country-side. This situation lasted for 10-15 years until the regime built enough new apartment-blocks into which it moved those workers and their families.