View local branch locations and hours. Mail. For deposits, loan payments or payoffs, remit to: San Diego County Credit Union Attn: Deposits, Payments or Payoffs P.O. Box 269040.Do you need a loan payoff request form? Friendly team members available MF 8 am – 6 pm and Sat. A payoff agreement is an informal contract in which a creditor agrees to accept the balance of a debt owed as full payment. For general information, please call: (800) 293-6494. San Diego, CA 92186-5304. Whether you are a dealer or a loan customer, Westlake has the resources to help you. Contact Westlake Financial today. Corporate Headquarters.