[kudokatz]

> like the ability to buy the flat after living in it for a certain number of years

The market would price this in, and then renters would just pay more for that right. Why not just leave the system as-is and let them buy if they choose?

OR there would be people getting kicked out of their rentals in order to avoid the "option" to buy becoming active, and then reactive legislation, and then ... a huge spiral of fights over market distortions that layer on top of each other.