Thank you Thomas. If I move into B as primary residency. Then I believe the interest for mortgage on B is not tax detuctable. And the LOC from A now is for purchasing 'personal' properties, in my opinion, it's not tax detuctable either. I need one more bedroom in B so have to move to B. Any...

I am new to this site and found out it's very helpful with all the experts in RE here. I have this situation and would like to have your opinion on options: Fact: 1. Have primary residency [PA], almost mortgage free. 2. LOC from PA for down payment to new house [PB] 3. large morgage on...