This could take you weeks even months to compile and weeks to update.
Why reinvent the wheel and do it all by yourself, or pay astronomical  membership fees when you can easily get this complete updated list of all the major office buildings in Montreal for a very small fraction of the price, can't you? Ask us about the database of the other Canadian metropolitan areas!Vicoria, Vancouver, Regina, Calgary, Edmonton, Saskatoon, Winnipeg, Toronto, Hamilton, Ottawa, Quebec and Halifax.

All the major office buildings of Montreal 

(Greater Montreal, Laval and South Shore Areas included)

Each entry includes

Here is a picture of the actual database

Montreal Office Buildings and Landlords Database