To complicate Berlin’s situation further, Germany’s constitutional court is expected in the coming months to decide whether these rent controls are even legal. If the judges nix the legislation, lots of tenants in the formerly regulated sector could get hit by huge and even retroactive increases in their rents. That would create yet more chaos.
The current Berlin housing market Situation has little definite insights on the effects of rent control, but all about risk aversion and maximization of profits.
The current shortage of supply is all about landlords withholding their vacant listings until that final court order. Or they are cashing out by selling them after fantastic interest rates averging above 10% year over the last decades.
If you feel you have like a 60% chance of getting double the rent, you avoid it at literally at all costs, below that threshold, to rent out on unlimited terms, if you can affor it in any way possible.
Where you're stuck on the long established mandated single digit rent increments, if the current pratice of shadow contracts should prove to be not enforcable.
There simply is just so much more uncertainty than actual rent control happening for the time being.