IMO it is good that Barcelona bought the building. I don't think regulating rent prices and the housing market helps lower rents.
In Poblenou, a district of Barcelona where I live, the city has decided that 50-70% of each property sold has to be purposed for social housing, i.e. limiting the rent to a fourth of the market price and choosing the tenants. Many of the district buildings are abandoned factory halls. I am rennovating one of them to become a house for my family, but am now forced to rent half of it to a poor family. From what I can see from the neighborhood is that there is almost no building activity and that private investments have stopped.
In Poblenou, a district of Barcelona where I live, the city has decided that 50-70% of each property sold has to be purposed for social housing, i.e. limiting the rent to a fourth of the market price and choosing the tenants. Many of the district buildings are abandoned factory halls. I am rennovating one of them to become a house for my family, but am now forced to rent half of it to a poor family. From what I can see from the neighborhood is that there is almost no building activity and that private investments have stopped.