The market value of owner-occupied real estate is north of 48 trillion dollars.
Working on fraction of mortgages related to GSEs
Total residential mortgage debts is roughly 14 trillion dollars. Depository taking institutions hold about 3 trillion. Fannie Mae and Freddie Mac hold 3.6 and 3 trillion respectively. And Ginnie Mae holds 2.5 trillion in mortgage back pools.
A key result of the Great Financial Crisis is that Fannie and Freddie switched from securitizing and guaranteeing mortgages to simply holding them as assets.
