The parent bank is located in Pennsylvania. Important: I am suing a subsidiary of the bank. There appears to be no Process of Service agent for this bank (it's a large bank) or its subsidiary - either in CA or PA.
Question: Should I send my demand letter to the subsidiary's corporate address, or the parent's corporate address? They are in the same city, at different addresses. I want to get this right so that the bank (or, it's subsidiary) can't claim they never received the demand letter, in order to frustrate my small claim. (I will send the letter certified mail).