William M. Shanahan, who goes by Bill, is a vice chairman of the Investment Properties Institutional Group at the CBRE Group Inc. With business partner Darcy Stacom, he has worked on some of the citys biggest trades.

Shanahan joined CBRE in 2002 after a 22-year career at rival Cushman & Wakefield. He has completed sales, advisory, joint venture, financing, leasehold, and development transactions totaling more than $60 billion in his nearly 30 years in real estate.

Shanahan worked on the $5.4 billion sale of the apartment complexes Peter Cooper Village and Stuyvesant Town to a group led by Tishman Speyer and the $3.9 billion sale of Harry Macklowes portfolio of buildings to Boston Properties that included the General Motors Building on Fifth Avenue. He also advised Google on its $1.8 billion acquisition of 111 Eighth Avenue.

Shanahans clients have included AIG, the Catholic archdiocese of New York, BlackRock, the Durst Organization, Macklowe Properties, MetLife, the Paramount Group, SL Green, and Verizon.

-TA