Aside from the opportunity to sign in-person at La Grande Bibliothèque in Montréal, the Québec (provincial) government has set-up an on-line book of condolences, all to be presented to Leonard Cohen’s family at some point in the near future.

P.S. I’m linking to the English version but should the page come up all-French, the English option is located in the top right-hand corner.

http://protocole.gouv.qc.ca/registre/en-CA/