A plan to prop up a struggling Doral-based bank appears to have been thwarted by an unexpected and unlikely factor: Miami’s fledging real estate boom.

U.S. Century Bank received $50.2 million in federal Troubled Asset Relief Program bailout money in 2009 but has since suffered significant losses. The bank said Wednesday that a deal led by local real estate investors to buy a 75 percent stake in the bank has been scrapped.