@Rob White
You are running into a non conforming structure. Many of my investors have purchased non conforming properties in Tampa. Run the risk/reward on it. The nice thing about it is most overlay districts in Tampa allow you to build an ADU accessory dwelling unit in the back. That's the hack. Call the city zoning dept and ask if the parcel is in an ADU eligible zone. Now you can make that garage unit legal.
Now, let's address the duplex in the front. If the property burns down or a hurricane crushes it, you lose your duplex and you rebuild as a SFR with an ADU because the new zoning status is SFH. You go from 3 units to 2 units. Again, make sure you are comfortable with the risk/ reward on it and the numbers would work.
One solution is to put it under contract with an addendum that the seller must receive a āformal decisionā thru city of Tampa with corrected āproperty useā with property appraiser prior to closing. If the current seller can show that the property was leased consistently and has the lease documents, the city might not ask much in order to sign off on this property to be grandfathered in as a duplex and update the āuseā status. It is a case by case. This process can take between 60-90 days.
Lastly, if you are using a real estate agent that invests themselves, they should be educating you on this whole process as this is a common yet solvable situation.