of it. Due to zoning restrictions, the CBC opted to retain ownership of the building while leasing out parts of it. The analogous facility for CBC's French-language networks is Maison Radio-Canada in Montreal. The CBC's corporate headquarters are located in Ottawa in the CBC Ottawa Broadcast Centre. Security and threats The so-called Toronto 18 terrorists included the building in their list of targets in a 2006 Ontario terrorism plot. In 2010, the broadcast centre was inside of the secure zone due to the 2010 G-20 Toronto summit protests and employees were not allowed to leave the building during portions of the rioting when gates into and out of the zone were locked down. A Canadian Security Intelligence Service regional office is located on Front Street West directly across from the CBC broadcasting centre, and helped identify suspicious packages and led to the arrest of a suspect in 2011. The CBC building in downtown Toronto had to be evacuated in November 2015 after someone taking stock of inventory in the archives stumbled upon what looked like a military shell. Police and military bomb technicians were called in and determined the shell was inert. In 2018, a user on website incel.me called on other users to attack the CBC and shoot employees, leading to increased security and Toronto Police Service being called. Television studios Studio 40 – 13,287 square feet (1234 m2) – Located on the 10th floor of the building, with a ceiling height of 18 m (60 feet), this studio is described by CBC as "the largest purpose built multi-camera capable studio soundstage in Canada." Productions filmed in this studio have included Dragons' Den, Canada's Smartest Person, Deal or No Deal Canada and various Paris By Night shows. Studios 41 and 42 – 11,070 square feet (1024 m2) each – Also on the 10th floor, these two studios are almost identical, and have been used by many of CBC's comedy programs, including Air Farce Live, Rick Mercer Report, The Ron James Show and The Red Green Show. Studio 41 was leased by Sportsnet to serve as the studio for its NHL coverage, including Hockey Night in Canada and was relocated to the Rogers Building in 2021. Studios 43 and 65 – 4,345 square feet (404 m2) each – Located on the 6th floor, these smaller studios have been used for CBC's talk show and lifestyle programming, including George Stroumboulopoulos Tonight,