Doors Open Ontario

CSS Building Inc. Doors Open Ottawa

CSS Building Inc.

In 1960, the North Atlantic Treaty Organization (NATO) and the Canadian Department of National Defense (DND) built a satellite communications station (SATCOM) at this location. It supports a 20.7-metre (68-foot) diameter metal space frame radar dome (radome) on its roof, which provides environmental protection for the 15.2-metre (50-foot) diameter SATCOM antenna that it houses. The antenna provided satellite communications between all NATO countries until 1999 when NATO and the DND decommissioned the site. That same year, it was purchased by Canadian Space Services Ltd. to serve as its corporate headquarters and training ground for employees. Today, it is owned by the CSS Building, which rents interior space to various local businesses. The two-hectare (five-acre) property currently has four domes on it that vary in size from three metres (10 feet) in diameter to 20.7 metres (68 feet) in diameter. A guided tour inside the building allows visitors to see inside the antenna to view a section of wave guide and the servo motors. Tours around the grounds and inside the building are available by appointment only. For Digital Doors Open, however, anyone can take a virtual tour through the video below.

Tell us your story about this site

  • Digital Doors Open
  • Virtual tour
  • Video
  • Guided tours available
  • Kid-friendly

Contact info

2336 Craig Side Road
Carp, Ontario


Year built: 1960
Building type: Commercial

Dates/hours open

Friday January 1 – Friday December 31, 2021
Part of Digital Doors Open Ottawa

CSS Building Inc. 2336 Craig Side Road