Actually, Clyde is half right. The Garn Act does not say anything except that a lender may not enforce a due on sale if the borrower encumbers the property with a junior lien. Remember, to encumber a property with a lien, you must convey an interest in the property. Theoretically, ALL conveyances are covered in the due on sale clause, but the Garn Act lists the type of conveyances that does NOT permit a lender to enforce it.
Subsequent court cases have said that a junior lien holders may foreclose and take title subject to the first mortgage and that said mortgagee cannot enforce the due on sale in this event. The rationale is that if the Garn Act permits junior liens, it’s also possible that such junior liens might end up being foreclosed. In one Colorado Appellate case, the court said that even a deed in lieu of foreclosure would not trigger the due on sale.
In practice, the first mortgagee rarely objects to the transfer anyway. And, remember that if the junior lien holder just makes up the payments on the first with no title transfer, the mortgagee cannot even balk because there’s not transfer of ownership.