The Main Library at 345 Aylmer St. N. opened on Tuesday, September 2, 1980. The library was built on the site of the old fire hall and had about triple the floor space of the old Carnegie building. The opening ceremonies were held on September 17 and featured Robertson Davies, Master of Massey College, University of Toronto, as the keynote speaker. A report in 2013 determined that the Aylmer St building no longer met community needs, and the city council of Peterborough in 2015 approved the demolition of the building and construction of a new building at the Alymer St site. A temporary main location at the Peterborough Square complex opened in May 2016, and demolition of old Aylmer St building began in July 2016.