An affiliate of New York-based JMH Development sold a Miami Beach property that was approved for a condo project. The company led by Jason Halpern turned a profit on the sale, but it likely could have made a larger return by building out and selling a condo building. However, condo sales have slowed in Miami-Dade County over the past year. Halpern’s 2901 JMH LLC sold the 17,150-square-foot site at 2901 and 2911 Indian Creek Drive for $7.75 million to 29 ICD LLC, managed by Gerard Longo, the head…