A milestone agreement in Detroit’s record bankruptcy requires its last major creditors to help revitalize the city’s downtown in return for cutting their losses from a $1.4 billion pension deal that went sour, Bloomberg News reported on Friday. Financial Guaranty Insurance Co. would indirectly own and pay to redevelop the riverfront site of Joe Louis Arena -- home of the National Hockey League’s Detroit Red Wings -- which will be demolished in 2017 when a new arena opens a mile away. FGIC would also get a share of $141.4 million in new notes in a deal announced yesterday in federal court in Detroit. The agreement brings the city closer to resolving its $18 billion bankruptcy, and would put a group of creditors that includes Aurelius Capital Management LP and and BlueMountain Capital Management LLC, owed about $1.1 billion, in charge of building a hotel and retail space in a downtown that civic leaders view as a linchpin of the city’s economic recovery.