Los Angeles has sued US Bancorp, accusing a unit of the fifth-largest U.S. commercial bank of becoming one of its biggest slumlords and blighting the city by allowing hundreds of foreclosed homes to fall into disrepair.

Monday's civil lawsuit by the office of Los Angeles City Attorney Carmen Trutanich alleges that US Bank NA has taken title to more than 1,500 foreclosed residential properties in the city in its role as trustee for various mortgage-backed securities trusts.