Presales begin this week on the 21-unit Nautical Pointe off Dauphin Island Parkway on Mobile Bay adjacent to Mobile Yacht Club, according to one of the developers, Fred Straub of Clear Image Construction. The two-, three- and five-bedroom units range from $218,000 to more than $700,000. The units include views of the bay and Dog River. Construction should start later this summer. Amenities include a lap pool, fitness center, covered parking and boat slip.