Buying Lot and building Multifamilyu

[Connor Bause]

I am looking at a .50 acre lot in Savannah that is currently zoned for 3-4 single family homes. In my preference I wanted to do a 4-6 multifamily building instead of single family homes. A few questions I have.

How do you start poking at rezoning a plot you do not own?

How  and what are the pricing steps needed to put into progress? Find a plan for a new build and send it to contractors for current rate of build, submit these plans with my re-zoning request? 

Who can tell me the details on how big of a building I can have on the plot? I am assuming the architect that built the plans?

Any insight will help.