Speculation: As Old as the Hills
As of the late-1800s Florida was still mostly an undeveloped swamp with beautiful beaches. This changed once some enterprising wealthy individuals saw the potential to create the necessary infrastructure, homes, hotels and shopping that would be required to bring in more residents and tourists. Then speculation added fuel to the fire. Click here for more from Ben Carlson on the Florida land boom of the 1920s.
Source: A Wealth of Common Sense