Consider a CMBS backed by a 80% LTV loan of a $50,000,000 office building. The loan is interest only with an 8% mortgage rate issued for 3 years with monthly payments. The CMBS is issued with 37.5% subordination with a coupon rate on the senior tranche equal to 5% and coupon rate on the junior tranche equal to 7%. An interest only residual carrying no principal will be issued as well.

Assume no default occurred. In month 35, how much did the residual tranche receive?