What is Total value of us mortgage market?

The total stock of mortgages outstanding in the US is about $10 trillion. However, the market value of these mortgages (whether still on banks' balance sheets or securitised and embedded in RMBS (Residential Mortgage Backed Securities)) is in reality lower by $1-1.2 trillion, due to the fact that U.S. homeowners can walk away from their mortgage leaving the lender with "no recourse". In other words, book mortgage value = about $10 trillion, while actual value is more likely $8.8 trillion to $9 trillion, due to losses on foreclosures. The total stock of mortgages outstanding in the US is about $10 trillion. However, the market value of these mortgages (whether still on banks' balance sheets or securitised and embedded in RMBS (Residential Mortgage Backed Securities)) is in reality lower by $1-1.2 trillion, due to the fact that U.S. homeowners can walk away from their mortgage leaving the lender with "no recourse". In other words, book mortgage value = about $10 trillion, while actual value is more likely $8.8 trillion to $9 trillion, due to losses on foreclosures.