The SCA Board members have a 3-year term, but what about the representatives from the Apartments and the Estates? Are they voting members?

Per the By-Laws, any Proprietary Member owning 150 or more units may each appoint one Director. Since the Apartments and the Estates each have over 150 units, the managers of each have a seat on the Board (and indefinitely, no term limit). Yes, they are voting members.