I was sent some great "Then & Now" shots of SOG Headquarters. Between July and August 1968, SOG headquarters, was at 606 Duong Tran Hung Dao (pictures of that would be great as well), and then was moved to the abandoned MACV HQs compound at 137 Pasteur Street.
Photos courtesy of Nguoi Tien Su, http://grunts.free.fr
The building in Saigon now
The building in 1968