Throughout its 70-year history as a military base, the mission of Naval Training Center (NTC), San Diego, had been to provide primary, advanced and specialized training for members of the U.S. Navy and U.S. Naval Reserve. In support of that mission, NTC expanded to include 300 buildings with nearly three million square feet of space. In designing the first buildings at the training station, Navy architects adopted the Mission Revival style. Within a few years, harbor improvements deepened the channel and anchorages in San Diego Bay and added 130 acres of filled land to the Naval Training Station, which was later renamed the Naval Training Center. Development of the base occurred in phases, often in direct response to national defense priorities. As a result, there was no comprehensive plan for NTC, and buildings were scattered throughout the base or existed in small clusters. The base eventually expanded to almost 550 acres.
By the early 1990s, San Diego had become home to more than one-sixth of the Navy's entire fleet. San Diego had more than a dozen major military installations, accounting for nearly 20 percent of the local economy with more than 133,000 uniformed personnel and another 30,000 civilians relying on the military for their livelihood.
The end of the Cold War led to military downsizing and the need to close surplus bases. In 1993, the federal Base Realignment and Closure Commission slated NTC for eventual closure.
The Navy closed NTC facilities incrementally. As the military functions on the base dwindled, so did the Navy's budget. Fearing that the lack of activity on the base would lead to security problems, the City and Navy entered into a master lease agreement in 1995 allowing the City interim use of 67 acres of the base site. The agreement was later amended to include more than half of the NTC property, with approximately 75 buildings occupied by interim users. These buildings were subleased from the City to various parties including film companies, nonprofit organizations, City departments, and small businesses. In addition, interim leasing allowed the City to maintain the buildings and landscape areas at a higher standard of maintenance than an otherwise decreasing Navy caretaker budget could provide. The Navy officially closed NTC on April 30, 1997, and all military operations ceased.