how to find out what is permissable building allowed?

[Jonathon Rios]

HI, i have a piece of land that currently has a 4 units builing on it. they are 4 units, 2/2.  it was built in 1950.. the land is under used... alot of space to the right and left of current builidng.  I would like to build a new building on it.. BUT i want to know what are the height restrictions.  I know it has to do with zoning department... To find out max height, units for my parcel, neighborhood, etc  who do i contact?   would I need to pay someone just to find out the basics? if so who, what type of professional?  do municipalities offer this information? specific department?

the property/land is in Miami Beach (not ocean or water facing) about 2 miles west of Collins Ave, 33141. and part of miami beach

anyone direction would be appreciated.  thanks alot