Gulfstream Park Tower, a condominium proposed at the site of the racetrack casino and retail complex in Hallandale Beach, has halted its sales. Brokerage ISG World listed the project as "cancelled" in its second quarter report on the Miami/Fort Lauderdale condo market. A spokeswoman of ISG World said the sales representatives at Gulfstream Park Tower told them they stopped sales at the instruction of the developer. A call to the sales office confirmed that sales have been halted. The developer,...