I thought a proxy is able to attend meetings on behalf of an owner/landlord. In the course is says that:

A salesperson has no right to attend owners' meeting,  whether in person or by proxy. Only unit owners such as the landlord can attend meetings. 

Is that correct?

Also, I understand that unit owners vote for Board of Directors and there must be at least 3 Board of Directors. Do all Board of Directors have to be owners of a unit in that building?