Earlier article confirming the CMBS involvement.
Fannie Mae last year provided $19.8 billion of financing for apartment properties, down from $35.5 billion a year earlier.
But instead of relying on its balance sheet, the housing-finance agency turned largely to the securitization market, funding $16 billion, or 81 percent of its originations through its mortgage-backed securities program. That compares with 2008, when only 17 percent
Actually there was nothing wrong with securitizing mortgages that were underwritten properly. In fact they were a very useful tool in spreading manageble risk and adding liquidity to the mortgage market. But a combination of risky underwriting and rating agency screw-ups blew it all up.