A footbridge extended from the mall's South Wing and connected with the Gulfgate Cinema I & II. This venue opened in April 1965, in conjunction with identical twin theaters at the MEYERLAND PLAZA and NORTHLINE SHOPPING CITY malls.
Photo from http://www.houstonarchitecture.com / "Nena E"


In 1966 and '67, the mall was enclosed and climate-controlled. Signage was updated to reflect this change, with a small umbrella added to the logo.
Graphic from Theodore W. Berenson Associates


Here, we see the new air-conditioned concourse at GULFGATE. The enclosure of the SHOPPING CITY was done as a reaction to the up-and-coming ALMEDA MALL, which was being developed on a site 6 miles southeast.
Photo from http://www4.uwm.edu / University of Wisconsin-Milwaukee Libraries Digital Collections



The mid-'60s roofing renovation was the only major reconstruction ever done. Following the enclosure, the official moniker would morph into GULFGATE MALL. This stage of the complex is depicted in this circa-1981 site plan. 


The GULFGATE MALL Center Court, as it appeared in the 1980s.
Photo from https://westfallgroup.com / Westfall Constructors, Limited