How about letting people build more and taller buildings? How about that, huh?
"The problems the fines are intended to combat began in 2007, when the financial crisis brought an epidemic of foreclosures on homes across Spain. After a nationwide wave of repossessions, banks found themselves the owners of newly vast portfolios of housing whose tenants had been evicted. Put off by the cost of renovations and wary of their potential obligations to rental tenants as landlords, many banks simply left their buildings empty, waiting for the market to bounce back so they could sell them at a higher price, or seeking permission for non-residential uses such as hotels."