Quarry Heights as of October 1, 1979, in green (green indicated a Military Area of Coordination on Treaty maps).  The small green area (not transferred in 1979 but considered joint responsibility for security) on the far right side in the above map was surrounded by the area that was transferred to Panama on October 1, 1979.  It is believed that small green area included what years ago was a Military Police motor pool which was next to an Enlisted Men Barracks. That area is now (since mid-1990s) the complex of Mi Pueblito, Antillean, and Indian villages representing typical scenes of the interior parts of Panama (a tourist attraction). That transferred area included the original front gate to Quarry Heights off Martyrs Avenue (renamed in January 1964 from 4th of July Avenue). The green area at the top center was the communications towers at the top of Ancon Hill used by U.S. Forces, including the Southern Command Radio and Television Network repeater tower for transmitting SCN's signal to the Atlantic side. 

On October 1, 1979, two housing units at Quarry Heights (on Morgan Avenue) were transferred to the government of Panama, as part of Treaty Day transfers.  Other changes also took place. Prior to that day, Quarry Heights boundaries flanked Martyrs Avenue facing Panama City (El Chorrillo section), Balboa Road up to Morgan Avenue, Morgan Avenue on the Ancon Hill side of the street, Quarry Road and Heights Road, and the Gorgas Hospital complex.  On October 1, 1979, portions of Quarry Heights were transferred to Panama. In July 1979, the Government of Panama constructed on top of Ancon Hill a base and mast for a huge Panamanian flag which was first hoisted October 1, 1979 and has flown day and night since then as a symbol of Panama having regained sovereignty over its territory.

Additionally, the front gate of Quarry Heights (since the 1940s until September 1979) was moved from the foot of Ancon Hill on Martyrs Avenue facing Panama City to current position further up the hill and redesignated the back gate with the back gate facing Balboa Heights redesignated the front gate.

September 27, 1997 the headquarters of the U.S. Southern Command departed Panama to its new site in Miami, Florida.  In January 1998 Quarry Heights was transferred to Panama.