Colau's star measure against "speculation": annual tax of 10% of the value of the home from the fourth house and for companies from the first.

Ada Colau has proposed a new annual tax of 10% on the value of homes to combat housing speculation, targeting owners with multiple properties. The tax would apply to individuals starting from their fourth home and to companies from their first. Owners can avoid the tax by renting homes at affordable prices, potentially lowering rents by 30% in high-cost areas like Madrid and Barcelona. The measure aims to release over 200,000 homes currently held by speculators into the rental market. Exceptions will be made for certain inherited properties and non-profit organizations. The revenue will help fund affordable housing initiatives. Colau also criticized Gabriel Rufián for failing to unite the left against right-wing parties.