I am getting ready to send a notice to owner regarding a large project that involves one owner and 80 properties (addresses). We were hired as sub contractors to install ac units at these properties. Can the notice include multiple properties (since it is the same owner / project) or do I have to send out 1 notice for each address, thus sending 80 notices? If that is the case, can 80 notices be sent in one big certified envelope (containing 80 separate notice to owners?