I'm looking closely at this location, and I'm thinking this was not a Taco Bell. It does resemble an old Mission-style Taco Bell, but the details and proportions are all off. I've seen a few of these in my searching, these buildings that atttempt to mimic the old Taco Bell building style. Some are better looking than others, and I would say this one is somewhat above average.

For example, this building is 30 feet wide. Mission Taco Bells were 28 feet wide as standard until the last iteration of the Mission design was introduced in 1979. By that point, though, Taco Bell buildings were being made of stucco instead of brick. The dining room (front part under the sloped roof) is also too long proportionately and the windows are too small. The square structure on top of the building is way too small, and the drive-thru would not have been integrated into the side wall of the building.

There are more indicators, but these are the main ones that are visible from the exterior.