Resign From Condo Management Committee

I am on the condo management committee for the building where I live.

For various reasons, I wish to resign formally. I understand that it is not sufficient to simply submit a letter of resignation to my fellow committee members but that the Land Office with which the committee is registered needs to be notified. Can someone please clarify the position for me?

Also, there are nine elected committee members though some have chosen not to attend meetings for varying lengths of time. Am I correct in thinking that a minimum of 5 members is required to form a quorum and that the chairman only has an additional vote in the event of there being a tie in the number of votes cast for a particular resolution?

Thanks,

Alan