Write a letter to the Bank requesting a mortgage loan.

Hello 

This is to state that I am interested in applying for a mortgage loan with <lender name>. I would appreciate if you would kindly send me information regarding your mortgage loans, including current interest rates, minimum amount of down payment, etc. I would be obliged if you provide me with an application form. You may mail the information to me at <mailing address>.

Thank you for your kind attention to my request. I shall look forward to hearing from you at the earliest.

Regards,