Banks can only take property--foreclose on it--if there is a security interest in or on that property *and* the borrower violates a term of a loan agreement in such way as to allow the bank to foreclose. So even if there is a mortgage with this bank on your primary home, as long as you do not default on that loan, the bank cannot take it--even if you default on another loan with the bank--except in the rare case where the loans are "cross collateralized" and your primary home was standing as a security for the investment property; if you agreed to that, then the bank could potentially foreclose. Otherwise, the most they can do is if they sue (such as for the unpaid balance of any loan on the investment property) and win and you still don't pay, they can look to put a lien on your primary home. The lien would be subordinate to any mortgage and would NOT let the bank foreclose; it would, however, be a cloud on title that would have to be satisfied before you could sell your primary home.