Do I have the option to make additional (nonscheduled) principal-only Golden 1 First Mortgage payments and what is the benefit?

Yes, you have the option to make principal-only payments.

Making principal-only payments may result in paying off the loan sooner and savings on interest. Your loan must be current with no fees outstanding before a principal-only payment will be applied. You can make the payment online by logging into Golden 1's website. Click on Mortgage, then Online Payment then Make a Payment or you can mail the check to the address below. Please note on the check that the funds are for principal-only payment.

Golden 1 Credit Union
Mail Stop 1270
1 Corporate Drive, Suite 360
Lake Zurich, IL, 60047-8945