Click here for link to the State Statute. Here are some key sections.
(d) The offender commits a felony of the third degree, punishable as provided in s. 775.082, s. 775.083, or s. 775.084, if the property trespassed is a construction site that is:
1. Greater than 1 acre in area and is legally posted and identified in substantially the following manner: “THIS AREA IS A DESIGNATED CONSTRUCTION SITE, AND ANYONE WHO TRESPASSES ON THIS PROPERTY COMMITS A FELONY.”; or
2. One acre or less in area and is identified as such with a sign that appears prominently, in letters of not less than 2 inches in height, and reads in substantially the following manner: “THIS AREA IS A DESIGNATED CONSTRUCTION SITE, AND ANYONE WHO TRESPASSES ON THIS PROPERTY COMMITS A FELONY.” The sign shall be placed at the location on the property where the permits for construction are located. For construction sites of 1 acre or less as provided in this subparagraph, it shall not be necessary to give notice by posting as defined in s. 810.011(5).