Comment by neom
I was thinking just for folks going down regularly on a B1, do you think it's worth having a copy of your lease or rental agreement in Canada or something similar? It seems most of the stuff I was seeing is about Canadians establishing roots using a B1.
The concerns on the part of CBP when someone is seeking admission as a B-1 business visitor are the appropriateness of the applicant's proposed activities and the applicant's ties to home/intent to return home (Canada). So you want to keep in your back pocket documents that address these concerns, such as a foreign lease agreement, foreign pay statement, and evidence of the purpose, such as a printout of the conference being attended or a letter of invitation. It's also really important to be prepared to provide specifics about your purpose, who, what, when, and where.