transactions this year include April's $19.32 million sale of a vacant oceanfront lot at 947 N. Ocean Blvd.; June's $18.5 million sale of Jimmy and Jane Buffett's estate at 540 S. Ocean Blvd.; and February's $17.1 million sale of 340 Polmer Park. Michael Schulhof, 67, is a private investor and a director of J2