New York-based Third Point thinks CoStar is trying to be the master of too many domains, which is holding back the stock.  
That was the message from the hedge fund, which owns just under 2 million CoStar Group shares, in a first-quarter note to investors. The April 30 note came the same month as a board shake-up at the commercial real estate conglomerate, and Third Point executives signaled that more changes were ahead. 
“After several years of uncertainty, we believe it is time for CoStar to begin the journey of meaningful self-help,” Third Point CEO Daniel Loeb wrote in the note, which disclosed a 3.7%…