Simply saying "be more capitalist" might work, but I'd say build more quality homes on all the scratchy pieces of land that exist round Berlin is an equally good option above firing people into the weird world of London property.
Finally the AirBnB/rentals thing is a result I'd guess of the massive number of people who hate having tourists traipsing through their buildings. My experience at least centrally was of large shared blocks of high quality flats and a lot of suspicion around strangers being granted entry to said gated communities.
As a result a property investment bubble feeds on itself and creates the london problem.
To reverse that you make it unattractive as a store of wealth and attractive as an active investment via renting it out. And you remove supply creation limits. You would decrease the unfair demand side by taxing them like a typical UK resident.
Also zoning policy usually doesn't help at all with typical height limits.
They bailed out all the banks to prop it up. After this help2buy (help2sell in reality) to have the govt underwrite risk when the banks stepped out.
This isn't capitalism.
They do it through the government by creating arbitrary regulations and barriers to entry.
We are already living in a world where the housing monopolies are enforcing their will on the population.
Getting rid of these regulations, and allowing people to build so many houses that the market price gets driven into the ground, is how we take the market back for the people.
I live in Honolulu, Hawaii. Prices here are RIDICULOUS, but this is the last thing I want. At some point growth has to stop or we will lose what makes this place what it is.
Someone ELSE can come it, charge less, and get all the customers to go to them instead.
This is what allowing more houses to be built would do.
The land value tax aligns the incentives right, so that the local administrations have an incentive to put the proper regulations in place.
Thus preventing them from bootstrapping, or demonstrating profits to investors.
Except there are huge entry costs, and all that theoretical ROI disappears as soon as you enter the market, because the existing monopoly starts competing.
To make a profit, you need some advantage over the them, like efficiency, innovation or goodwill. If all you can do is exactly what they do but at market price, well... they can do that too.
If someone started building a whole bunch of housing in SOMA, do you believe that this ROI would disappear quickly, due to housing prices hitting rock bottom?
Do you really believe that would happen?