Edelman, an independent public relations firm, has extended the lease for its co-headquarters offices at downtown Chicago’s landmark Aon Center through 2020, the building’s owner, Wells Real Estate Investment Trust, announced today.

The value of the transaction was not disclosed.

Based in Chicago and New York, Edelman has some 350 employees on four floors of the Aon Center, located in the East Loop. Under the new lease, Edelman will add approximately 6,700 square feet to its current 112,000, with additional future expansion rights.

Aon Center, built in 1972 as the Standard Oil Building, is a modern landmark on the city’s skyline, with more than 2.6 million square feet. Wells REIT acquired the property in 2003.

Wells REIT, which closed to new investors in 2003, is a public, nontraded REIT specializing in class A office properties.

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