Gerald W. Blakeley, III, is selling a three-bedroom, three-bath condo at 5556 N. Ocean Blvd. in Ocean Ridge for $850,000.

The unit contains 2,361 square feet. Built in 1987, the Ocean Ridge Yacht Club is a 29-unit condominium development.

Anastasios E. Varvarikos is the agent for the listing.

Blakeley is president of Extech Instruments, a full-line supplier of handheld electronic measuring equipment and portable printers based in Waltham, Mass. He is a member of the international advisory group at Tufts University’s The Fletcher School in Melford, Mass.

There were 40 condo sales in Ocean Ridge in 2008, with a median price of $600,000.

Address: 5556 N. Ocean Boulevard, Unit: 5A