“BELIEVE IN WHAT you sell,” Michael Martinez tells AQUA Pinecrest, “and, trust me, you will enjoy much more success.” The Miami born and raised ONE Sotheby’s International Realty Senior Vice President certainly knows of which he speaks: On the success side of the ledge, over the last quarter century he’s been a certified Top Producer company-wide for more than a dozen years with career gross sales approaching $2 billion. (He earned the distinction of #1Top Producer, period, i