Deltek prepares to move into its new headquarters. The firm’s prominent clients are listed on the glass wall. (Jeffrey MacMillan/For Capital Business)

Forget the corner office — at Deltek’s new building in Herndon, the chief executive is in the corner cubicle.

Deltek, known for providing software geared to government contractors and professional services firms, starts work today in a new office that consolidates existing facilities and incorporates the company’s latest acquisitions.

The office is the first that Deltek has designed — it previously moved into already furnished spaces — and the company wanted an open and collaborative space.

As a result, there are no closed offices, and Kevin Parker, the company’s president and chief executive, is in a cubicle alongside other employees.

The consolidation marks the latest in a series of changes for Deltek, which has been buying up companies quickly since New York-based private equity firm New Mountain Capital bought 75 percent of Deltek’s shares in 2005.

The exterior of Deltek’s new headquarters. (Jeffrey MacMillan/For Capital Business)

Most recently, Deltek has picked up market research and consulting company Washington Management Group, based in the District, and its Tysons Corner-based FedSources and FedSources Consulting businesses. Deltek also previously bought Reston-based Input, FedSources’ primary competitor, as well as Danish firm Maconomy, which provides services to advertising, public relations, accounting and consulting firms; Reston-based mySBX, an online network that allows government contractors and professionals to find partners; and Planview’s MPM division, which makes project management software.

Parker said Deltek first considered consolidating its facilities when it saw that the new building — at 2291 Wood Oak Drive in Herndon — was available. Deltek has space for about 750 people in the facility but will move in about 630 drawn from five different offices. The company is vacating three Deltek offices in Herndon as well as Input’s Reston office and FedSources’ Tysons Corner building.

The company enlisted architectural firm HOK, a longtime client, to design the office. Catherine Haley, a principal at HOK and its director of interior design, said the facility was set up to have plenty of areas where employees can congregate for meetings or even to socialize. One floor, for instance, offers foosball, air hockey and Wii.

The office boasts almost 50 enclosed meeting spaces and more than 100 open meeting spots, such as small tables arranged next to whiteboard-equipped walls where groups can have informal discussions.

The facility has nearly 100 spaces for “hoteling,” or unreserved desks employees can use for a temporary period. This strategy has helped companies save space by pooling the desks of employees who frequently travel.

The building also features a customer center and Deltek University, a group of conference and training rooms on the first floor where Deltek can host potential customers and train them on how to use Deltek’s software and services.

“For the entire company, it’s going to bring a sense of community, a sense of collaboration and teamwork that hasn’t been there before,” Parker said. “We’re going to stay in this building for a while.”

The architectural firm HOK designed the new office building. Here, an interior view of the headquarters. (Jeffrey MacMillan/For Capital Business)