Whether you should sign for a landlord is not suggested unless absolutely necessary. i.e. deployed military or strong business association.
I'm not sure if the State of Florida would restrict residential leases to only one year (if prepared by an attorney) but it is true that a Realtor can only use the "approved" fill in the blank lease form and it cannot exceed one year, take a look at the Florida Supreme Court Ruling:
Oh and if this is about a Short Sale and with the highly unusual long lease in Lutz, I actually asked the tenant if his Realtor completed the lease agreement and he said no it was prepared by the Law Firm that is also charging fee to the buyer to "negotiate" the short sale. Yet another reason not to waste time with a non-approved Short Sale...too many things can go wrong "before" it ever gets approved to sell.
All the best,