Today, November 2, 2019, I received my letter back as a RTS.
According to the envelope he is no longer at SBV...

THIS ADDRESS NO LONGER WORKS
Sutton-Barth & Vennari
5900 Wilshire Boulevard
Suite 700
Los Angeles, CA 90036
USA
PS: if anyone has an updated address let me know. I also believe Mr. Corbin doesn't sign anything unless it includes a S.A.S.E.
