An affiliate of Blackstone is preparing to issue a rare non-agency mortgage-backed security backed by jumbo reverse mortgages, according to filings with the Securities and Exchange Commission. A handful of non-agency MBS backed by jumbo reverse mortgages were issued before the financial crisis and none appear to have been issued in recent years. Blackstone’s Podium Mortgage Capital hired Clayton to perform due diligence on 280 jumbo reverse mortgages. The loans were ...