Florida waterfront setback variance questions???

[Nick Ruocco]

I have a waterfront property in Bradenton Florida that has a variance for the the rear setback (seawall) that was approved in 2010. It says “Variance granted to reduce the rear yard setback from 20 feet to 5 feet in order to elevate an existing single family residence”. Does this mean I could build a structure such as a pergola or shed closer than 20 feet? Or are variances specific to the project? Thank you!

Any information would be helpful. Thank you!