This is a trailer park behind the old Sea Shell motel. The trailers were right on the Gulf. Gone are the days when living on Clearwater Beach was for middle class retired seniors, not to mention lax building codes. Those stumps are likely Australian Pines (Casuorina sp.). The island was once covered with them.
Here is a view looking towards the Sea Shell showing all the Australia Pines.
© Original 35mm Kodachrome transparency