1100 Superior

1100 Superior (formerly known as the Diamond Shamrock Building, the Diamond Building, and Oswald Centre) is a skyscraper in downtownCleveland, Ohio‘s emerging Nine-Twelve District, which is also home to One Cleveland Center, Ohio Savings Plaza, The 925 Building, PNC Center, and the former Eaton Center. It was built in 1972 for the important San Antonio, Texas firm of Diamond Shamrock which specialized in oil refining, it has 23 floors and rises to a height of 282 feet (86 m).[1] It was designed by the firm of Skidmore, Owings and Merrill which also designed the nearby AECOM Building, and the Willis Tower in Chicago, Illinois. The firm was a leader in the modernist tower block design at the time of construction which believed in three principals: heavy metal anchoring, profuse windows for air and light, and simple muted dark colored facade paneling that gave their landmark buildings a “natural” organic look.

Skyscraper in downtown Cleveland, Ohio
1100 Superior

The Diamond Shamrock Building (now 1100 Superior) rises behind Chester Commons (now Perk Park) in 1973

1100 Superior
Former names
Alternative names Oswald Centre
General information
Status Complete
Type High-rise
Architectural style International
Classification Office
Location Nine-Twelve District
Address 1100 Superior Avenue
Town or city Cleveland, Ohio


Construction started 1971 (1971)
Completed 1972 (1972)
Owner American Landmark Properties, Ltd.
Landlord Kowit & Passov Real Estate Group
Architectural 282 feet (86 m)
Tip 282 feet (86 m)
Roof 282 feet (86 m)
Technical details
Floor count 23
Floor area 27,677 square feet (2,571.3 m2)
Grounds 550,000 square feet (51,000 m2)
Design and construction
Architecture firm Skidmore, Owings & Merrill, LLP
Structural engineer Skidmore, Owings & Merrill, LLP
Main contractor Turner Construction
Other information
Number of restaurants 2
Parking Attached garage – 335 spaces

It is located at 1100 Superior Avenue along East 12th Street. In 1994, during a water main break, a four-story section of the Diamond Building lost some of its glass from pressure of the water. In 2012, the tower’s naming rights were purchased by insurance brokerage the Oswald Cos. (which is written in bright red multistory letters on the north and south sides of the tower), one of its largest tenants.[2]

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  1. Emporis.com: Diamond Building. Accessed 2007-04-20.
  2. McFee, Michelle Jarboe (November 12, 2012). “Oswald Cos. will stay in downtown Cleveland, lease three floors at 1100 Superior building”. The Plain Dealer. Cleveland, Ohio. Retrieved April 4, 2014.

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