The drone's-eye view of the library shows off recent additions like the glass entrance cube, the new Yonge Street façade expansion and a new exhibition gallery space.
The library first opened in 1977 and remains the largest public reference library in Canada.
It was designed by Raymond Moriyama, the same architect who designed the Ontario Science Centre, Toronto French School and the Bata Shoe Museum.
Watch the video below to follow the drone through the library, or click here if you're on mobile.
The Toronto Reference Library is holding a party to celebrate the revitalization effort, with demonstrations, refreshments and tours beginning at 4 p.m. on Friday.