The U.S. General Services Administration is soliciting proposals from developers interested in constructing a "build-to-suit" office building at Stapleton that could be open as early as January 2010, officials said today.

The building, , which GSA would lease for 20 year, would be on approximately 10 acres bounded by the Quebec Square Regional Retail Center on the west, Ulster Street on the east, East 36th Avenue to the north and East 35th Avenue to the south.

The building is proposed to have approximately 175,155 square feet of rentable space, and will include an attached, 175-space parking garage, with an additional 45 spaces of surface parking elsewhere on site.

On Feb. 1, GSA executed an assignable Option Agreement for the purchase of the acreage with FC Stapleton II, LLC, an affiliate of Forest City Stapleton, Inc., master developer for the former airport.

The land is north of the former airport’s 5,000 car parking structure in an area zoned for office and other commercial uses and envisioned for a "corporate campus" development.

The GSA parcel is close to the Smith Road rail corridor that will be served by the FasTracks commuter rail in 2014 linking Downtown and Denver International Airport. The rail service is anticipated to have at least one stop at Stapleton.

"Stapleton is ideally situated to serve the needs of corporate users or other tenants such as the GSA," said John Lehigh, chief operating officer for Forest City Stapleton, Inc. "It offers office space that is within walking distance of homes affordably priced for a range of incomes, beautiful parks, new schools and a wide variety of retail that will enhance the quality of life for employees."