Redwood Trust is acquiring enough “expanded-prime” mortgages to put together a non-agency securitization, according to officials at the real estate investment trust. Redwood announced this week that it plans to issue a mortgage-backed security collateralized by loans from its “Choice” program as soon as September. The Choice program allows for somewhat looser underwriting standards than what’s typically seen in the jumbo MBS market, such as slightly higher debt-to-income ratios or ...