Just because the tax bill is due, it does not make the loan 120 past due. As IH indicated, you would call the loan based on the failure to pay the taxes (assuming that is a default under your loan agreement) and then after 120 days, you could foreclose. There is no other provision that allows foreclosure because of default on another condition within the loan agreement other than the due on sale clause or foreclosure action by another creditor.
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