It's unclear as yet where Callahan will be stationed, and the former EOP chief is vacationing this week and unavailable for comment. But clearly, he's the man for the job. He was president and CEO of Equity Office Properties from 1996, leaving in April of this year, and he conducted the REIT through some if its most dramatic growth.

Before joining Equity Office, Callahan served as EVP of Equity Group Investments Inc., where he was responsible for coordinating all financing and capital-markets activities affecting the company and its portfolio investments.

Wold, who has been with the organization since 1995, will continue to serve as chief investment officer, responsible for Trizec's investment and portfolio strategy, and will oversee its management and leasing operations. Previously, he was president of TrizecHahn Office Properties, formerly the US-based subsidiary of TrizecHahn Corp.

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John Salustri

John Salustri has covered the commercial real estate industry for nearly 25 years. He was the founding editor of GlobeSt.com, and is a four-time recipient of the Excellence in Journalism award from the National Association of Real Estate Editors.