The James R. Mills Building is a 120-foot (37 m) mid-rise governmental office tower in San Diego, California, United States.

The building is named in honor of James R. Mills (June 6, 1927 – March 27, 2021), a California state lawmaker who authored legislation creating the San Diego Trolley.

[9] The building would be trimmed in red (the color of the San Diego Trolley) and the ground floor would contain 7,500 square feet (700 m2) of retail space.

[8] Construction of the project was financed with a then-new method: the developer, Starboard Development Company would sell $43.5 million in bonds with Swiss financiers, and upon completion of the building, the debt would be transferred to the San Diego Regional Building Authority, a joint powers authority created by San Diego County and the MTDB.

[8] Construction would present additional challenges with trolleys continuing to operate through the site and the architect choosing to use unusual material called STO for the exterior which is insulated, waterproof and allowed for unique window recesses and details.

It was shipped unassembled to San Diego from Switzerland in a jumbo jet and over 12 days, Swiss technicians put the timepiece together on site.

[14] After opening, the building was named in honor of James R. Mills, a former California state senator who authored legislation creating the San Diego Trolley.