Two mortgage-backed securities with non-qualified mortgages originated by Impac Mortgage Holdings are in the works, according to presale reports released last week. An affiliate of Starwood Capital Group plans to issue a $280.0 million MBS with loans solely originated by Impac, while Deephaven Mortgage plans to issue a $374.3 million deal with production from 77 lenders, led by Impac with a 14.7 percent share. Among nine mortgage-backed securities ... [Includes two briefs]