Chris Costa, CEO and president of Knapp Properties, a development, brokerage and property management company, stands in newly renovated Class A office space in the building. Photo by Duane Tinkey

The Weitz Co. is leasing the third and fourth floors and a portion of the first floor of the office building at 611 Fifth Ave. In February, desks for employees were set up. Photo by Duane Tinkey

A new staircase in the newly renovated office building at 611 Fifth Ave. Photo by Duane Tinkey

Small windows were replaced with large ones throughout much of the building. The larger windows provide views of downtown Des Moines. Photo by Duane Tinkey

An architect’s rendering of the renovation of an office building. The building is owned by Knapp Properties. Rendering by Substance Architecture

Before the renovation, the interior of the office building at 611 Fifth Ave. included ceiling tiles and small windows that made the space dark and unwelcoming. The renovation included adding larger windows and removing the ceiling tiles. Photo special to the Business Record