The Aon Center (200 East Randolph Street) is a modern skyscraper in Chicago designed by architect Edward Durell Stone and completed in 1972. With 83 floors and a height of 346 m (1,136 ft), it is the second tallest building in Chicago, surpassed in height only by the Sears Tower. It is the third tallest in the United States behind the Empire State Building and the 14th tallest in the world.

History

When the building was originally built, it was the world's tallest marble-clad building. Eventually, the harsh climate caused The building's Carrara marble sheathing to fail and begin to detach from the building. From 1990 to 1992, the entire building was refaced with white granite at a cost of half the original price of the whole structure. The building employs a tubular steel-framed structural system with V-shaped perimeter columns to resist earthquakes, reduce sway, minimize column bending, and maximize column-free space.

Originally named the Standard Oil Building (often dubbed "Big Stan"), it was renamed the Amoco Building when the company changed names in 1985. When the building was sold in 2001, it became known as the Aon Center.

In early 2003, the Aon Center was sold for $465,000,000.

Exterior lighting

In the early 1980s, the lights in selected offices in the building were turned on to form a huge cross during the Christmas season. In recent years, the top floors of The building have been lit at night with colors to reflect a particular season or holiday. Orange is used for Thanksgiving, green or red for Christmas, and pink during Cancer Awareness Month. The lighting commonly matches the nighttime lighting on the antenna of the Sears Tower and the upper floors of the Merchandise Mart.

Tenants

Aon is the building’s largest tenant, subleasing from BP. It leases a rentable 47,852 m² (515,083 sq. ft.), or 20.60% of The building.

BP

Kirkland & Ellis

DDB Worldwide

Element 79

Jones Lang LaSalle

Daniel Edelman Inc.

LocalLaunch! Inc.

ThoughtWorks

R.H. Donnelly

Chicagoland Chamber of Commerce

Source: www.wikipedia.com

I had a technical problem registering this property, yesterday.  I had entered 'Aon Center' and it appeared only as 'Aon'.  I'm not sure how this happened; it could have been my browser, it could have been a technical hiccup, it could have been the dentist downstairs who doesn't like me.  Regardless, I sent a note to Weblo support explaining the situation and they corrected it immediately.  See? Up there.  At the top. ^ Aon Center. 

There is one particular member of their support team that's been particularly helpful to me whenever I've had a problem and, believe me, I've had my share.  I'm not going to tell you his or her name, though.  Not because I don't want them to get the credit they deserve, but because whenever you have a problem from now on, you'll go right to them and monopolize (on steroids) their time and then I'll never talk to them again and then I'd be very sad!  I do want to thank you, Member Support Person X, for another job well done.