PHOENIX-Convenience store giant Circle K has outgrown its headquarters. Tosco Marketing Co., which owns and operates thousands of Circle Ks through the southwest, is adding a second phase to its headquarters at Washington Street and Priest Drive in Tempe. Construction started this month.

The second phase will add 170,000 sf of office space, adjacent to the 250,000-sf existing building, which now houses 1,000 employees.

Tosco consolidated its office functions into the first-phase building over the past several years, vacating a number of smaller buildings throughout the Valley. The first phase includes an on-site daycare center, a mini-Circle K store and café.

The six-story structure under construction will have a 900-space parking garage. The building is scheduled for completion next October.

The Phoenix office of Ryan Companies, a general contractor and development company, which built the first building is also constructing the new one.

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