Use the same property type and get as close in range in year built and square footage as you can to get at least 3 good comps.  

That being said there are very few homes for rent in the immediate area and even less homes that have sold at this square footage.

You should get a little break of the taxes while you live there, at least on the portion of the square footage you occupy, but I'd do the calculations based on what the numbers would be if the whole thing was being rented out.Kelly

The rehab is more than doubling the existing square footage.

The pans are way way to fast- your really rusing through the home - you spent 10 seconds in the kitchen (approx)- Hold the camera more steady and level - your off-level more then your on level- Be aware of the apature - windows are going to blow out your indoor so try to keep them not so visible....this takes time and creativity for sure - or play around with your own apature setting so it isn't automatic - let the windows blow out but it will not dim the floors / walls that your trying to show off- your camera / footage is good quality outside - I would invest in a light for the indoors- i would invest in a wide angle lens- show the exterior - all of it - front / back / sides - do a 360 of the street / block....- I might go right to the house and use text to show everything you just said but be discrete with it - not full screen.I tink it is better then you think to be honest - you can always add in a title screen and a close screen with your logo / fancy graphics etc....that woudl be sizzle - add in a map and do a zoom on the map while your talking about where it is - have text on screen listing all the things you forgot to say while your walking around :)

On the efficiency size, you can truest never size a heating or cooling system by square footage.

And I am trying to find out a rough estimate of the average dollar amount per square footage for a full rehab and a light rehab on a typical house in Fort Lauderdale area?

It sounds like they are adding in the attic space to the total square footage.

Zoning restrictions don't really affect renovations to a property unless you are adding a bunch of square footage or building a new property (building a new property isn't really value-add as it is really opportunistic). 

To save on the brain damage I would consider either doing it via head count, or something like square footage of the unit.