His company has leases ending at the end of the fourth quarter this year, and there are many locations where EDS could possibly save money or get a better hold on the Detroit area.

Gilman tells GlobeSt.com the company owns four buildings in Southeast Michigan, and leases space in 25 buildings.

"We're looking for places to go or stay; we don't have to go anywhere," Gilman says. "The Renaissance Center is just one of the places we're looking. We have to make sure any move would be cost effective."

About 500 of the company's 9,000 employees in the area already work with GM at the RenCen. He says GM is the largest client in Detroit, but onlyrepresents 13% of the company's business.

The automobile maker bought the building in 1996 for a new headquarters, and has been working on a $500-million redevelopment of the 1-million-sf landmark on the Detroit River.

The building had been used by many tenants prior to 1996, and had actually been constructed with Ford Motor Co. assistance. After GM bought the building, it took over many floors of the five towers.

The RenCen has four 39-story office buildings and the 73-story Detroit Marriott Renaissance Center Hotel. The retail portion in the lower levels have been configured to create clusters for retail and service firms, and include a proposed five-story atrium mall overlooking the Detroit River. The GM headquarters portion has offices for more than 5,500 GM employees and 2,500 non-tenant GM employees.

EDS provides strategy, implementation, business transformation and operational solutions for clients managing the business and technology complexities of the digital economy. The company has 140,000 employees worldwide.