Well, it’s one solution:
Labour also wants to give councils powers to force landowners to sell vacant sites to build new housing at lower prices than the compulsory purchase system currently allows.
So the council just steals the land then? Yes, forced sale at less than market value is theft, indeed it is.
And societies where government can just come along and steal your stuff tend not to work out very well. If you doubt this just think how that recent Liverpool City Council would have dealt with such powers……