One South Church

At 23 stories high, One South Church is the tallest building in Tucson, and is a prominent fixture in the city's skyline.

"The Tallest Building Downtown", or the "The One with the Blue Roof" as it is often referred to by locals, is home to a variety of office tenants, including New York Life, Regus, and some of Arizona's largest law firms.

The building was designed by Fentress Bradbrum Associates of Denver as one of two twin towers in a city center complex.

It was later known as the UniSource Energy Tower In October 2015, One South Church was acquired by local ownership group 1SC Partners, LLC, managed by Zach Fenton of ZFI Holdings, LLC.

The Leo Kent Hotel opened in the building's bottom 9 floors in 2023.