This month residents of Berlin should experience the biggest collective rent reduction in history. About 340,000 residents - one in six - may be eligible for a rent cut under the Mietendeckel, Berlin’s radical new housing policy. But landlords are doing their best to stop it. On November 23 landlords must reduce rents to regulation levels or face fines of €500,000. Tenants can check if they're paying too much at this website: http://www.mietendeckel.berlin.de And they can report cheating landlords to the city government here: https://service.berlin.de/dienstleistung/330040/ Anyone who gets a rent reduction should save the money, as they might have to pay it back. The Mietendeckel is being challenged in Germany's constitutional court, with a ruling expected in mid-2021. Jöran Mandik explains the court process - and the judges' red robes. Rent Freeze is produced and presented by Joel Dullroy, Maisie Hitchcock, Jöran Mandik and Daniel Stern. Music by Tom Evans. Artwork by Jim Avignon. Produced in partnership with RadioEins, Berlin's public broadcaster.