Affiliates of American International Group are set to issue their first jumbo mortgage-backed security, according to presale reports released this week. AIG’s residential mortgage lending group has been acquiring jumbos on a correspondent basis since 2013, amassing more than $4.50 billion in holdings. The planned CSMC 2017-HL1 Trust is a $511.98 million securitization of loans acquired from a variety of lenders. The MBS will be issued on a Credit Suisse shelf ...