Did he actually rewire the house or just use existing wiring and bring plugs, switches, and visible components up to code?

Also, how does your insurance company feel about renting out a unit not up to code? 

So we went to get it subdivided into 4 equal lots.The survery district approved 4 , 1200 sqft lots but it did not pass zoning code for RSA-5 district .1.

You need to look at Miami zoning code, landlord tenant regulation.

We understand that there are building codes that we have to follow and permits that we have to get from the building department.Does anyone know if we need something from the planning department?

Forget about the LLC and asset protection classes, be good, have insurance (an umbrella when you get rich) and abide health and safety codes you will be fine.

They will examine the zoning code and advise as to how big your structure could be to comply with all relevant ordinances.

@Remington Lyman so far I’ve narrowed it down to A and B zip codes (defined in a document from Zeke at Reafco), and in the near future I’d like to narrow that down from around 20 zips to 5.

Yes, both condos are also in the same zip code! 

I'm Brian Silvia -- by day I write & ship code, but by night I'm either doing Crossfit with my wife, or working with her to get spun up on real estate investing.