'The mortgage cheat code': If you want lower interest rates, there's a little-known way to get them — if you qualify

'The mortgage cheat code': If you want lower interest rates, there's a little-known way to get them — if you qualify

Assumable mortgages are becoming an increasingly popular home-financing option.Allison Dinner /Stringer /Getty Images <ul><li>Homeowners with certain loans can sell their low-interest-rate mortgages… [+6622 chars]

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