Converting a single family home into a triplex.

[Connor Deneen]

What is the best way to go about legally turning a property that is zoned as a single family home into a triplex?

The property currently has a 3 bed 2 bath unit (main house) and then two lofts in the backyard. All units are on their own meters, but the owners of the property are living in the main house. If I go in on this deal I plan to live in the house for a bit and then eventually move out and rent out all three units. (The two lofts are already rented out on a month to month basis while the property is on the market.)

1) Can I rent out the properties when I'm not there WITHOUT changing the zoning. (It's zoned for single family residential in Milton, Florida).

2) If I do have to rezone it, what is that process like and how does that effect the resale value of the property if at all? 

Any other input would be greatly appreciated as well. Thanks!