This place also goes by the English name of the Macao General Chamber of Commerce Public Library - or more often than not the 'Octagonal Library'. It's a rather striking small pavilion, built in the 1920's, that used to be part of the adjoining gardens before road widening works moved it to it present position sometime in the 1930's.
We also get to see it in the film as Bruce (Jason Scott Lee) is carried by his adoring fans out of the Cineteatro and down through the streets to celebrate his new film The Big Boss.
Whenever I've passed this place it's always been shut, but it sounds as though this place opens regularly in the evenings for the local elderly contingent to come down and read the various papers and magazines stored inside.
I should really have included this in my previous post about the Cineteatro because it's just in front of that cinema, however, I feel this place deserves a post of its own.