After many thoughts about the future of the former Gillian’s Wonderland in Ocean City, developer Eustace Mita brought a proposal for a 252-room hotel to be known as “Icona in Wonderland” to a meeting of the Boardwalk Merchants Association.The total cost of the project could fall between $135 million and $155 million, Mita said. The longtime Boardwalk amusement park closed in October. After investing millions while the park was up for foreclosure, Mita owns the property, for years leasing it to Wonderland CEO Jay Gillian, who is also Ocean City’s mayor.