One South Church

{{Short description|Highrise in Tucson, Arizona}}

{{Use American English|date=February 2025}}

{{Infobox building

| name = One South Church

| image = UniSource Energy Tower, from intersection.jpg

| caption = One South Church Building with its parking garage to the right.

| completion_date = 1986

| location = 1 South Church Avenue.
Tucson, Arizona, United States

| coordinates = {{coord|32.2217363|-110.9720755|display=inline,title}}

| status = Complete

| start_date = 1985

| opening = 1986

| building_type = Office

| antenna_spire =

| roof = {{convert|330|ft|m|1|abbr=on}}

| top_floor =

| floor_count = 23 (+3 below-grade)

| floor_area = {{convert|241,000|sqft|abbr=on}}

| elevator_count = 9

| main_contractor = M. M. Sundt Construction Company

| parking = 3 subterranean levels

| architect = Fentress Bradburn Associates

| developer = Reliance Development Group/Venture West Group (joint venture)

| owner =

| references = {{cite web|title=UniSource Energy Tower|url=http://www.skyscrapercenter.com/building/unisource-energy-tower/9789|website=Skyscraper Center|publisher=CTBUH|accessdate=2017-08-27}}

}}

One South Church (formally United Bank Tower and UniSource Energy Tower) is a 23 story office building located in Tucson, Arizona.

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 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 has its own parking garage located underneath the building.

The building was designed by Fentress Bradbrum Associates of Denver as one of two twin towers in a city center complex. The second tower was never built. Developers of the project were Reliance Development Group of New York and Venture West Group of Tucson.{{Cite web |title=22 Feb 1985, Page 1 - Arizona Daily Star at Newspapers.com |url=http://www.newspapers.com/image/167610942/?terms=fentress&match=1 |access-date=2022-07-06 |website=Newspapers.com |language=en}} Construction started in 1985 M. M Sundt Construction Company of Tucson was the general contractor.{{Cite web |title=13 Dec 1985, 51 - Tucson Citizen at Newspapers.com |url=http://www.newspapers.com/image/578523374/?terms=United%20bank%20tower&match=1 |access-date=2022-07-06 |website=Newspapers.com |language=en}}{{Cite web |title=10 Oct 1985, Page 47 - Arizona Daily Star at Newspapers.com |url=http://www.newspapers.com/image/164655428/?terms=United%20bank%20tower&match=1 |access-date=2022-07-06 |website=Newspapers.com |language=en}} When opened in 1986 the building was known as the United Bank Tower. 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.https://tucson.com/news/local/see-plans-for-inside-the-new-leo-kent-hotel-in-tucson/video_0e3e0eac-e82d-58c6-94fd-16fe74c730ea.html