Prague had rent control for over two decades. Regulated rent was about 5x lower than commercial. Over time this lead to some interesting stuff:

- home owners would cut hot water and electricity, just to get tenants out.

- there was regular black market where one could buy contract for cheaper rent

- tenants with lower price would subrent apartments for commercial price

- in Prague it was highly discriminatory for students and other poor people, who had to live in Prague.

- It did not protected city center anyway, people eventually moved away.

- there was huge conflict of interest. Some PM, government members, town hall officials... lived in cheaper apartments.