Baker Construction & Development Inc., of Spokane, plans to construct a second-floor addition to the historic Schade Towers east of downtown, says Kirk Ledbetter, a project manager for Baker.

The project will add 5,000 feet of office space to the 70,000-square-foot, five-story building, at 528 E. Spokane Falls Blvd., Ledbetter says.

The addition will be built atop a one-story part of the structure on the east side the main building, he says. USKH Inc., of Spokane, designed the project.

Baker Construction plans to start work in the fall, and it will take about four months to complete. Ledbetter declines to disclose the project cost.

He says the addition will be similar in appearance to the rest of the brick building, which is listed on the National Register of Historic Places.

Barry Baker, president and CEO of Baker Construction, heads an investment group that, along with Black Proinvest LLC, bought the building in 2005.

The original structure was erected in 1903 and housed the Schade Brewery. It was converted to commercial and office space in the 1990s.