Yes, as an investor, you can request an extension with HUD, though approval isn’t guaranteed.

You have to go to their website and set up for a demo and go through the process that way.  

On large complexes you can look up their website and see if they have a leasing map that identifies address/unit.

Make sure you run your numbers higher. 

Quote from @Jamie Hora: The question you pose in the title, "Is a rezone required if availability study can support more density". 

If you don't hire a PM refer to a attorney.

It’s crucial to stay disciplined here, as overspending on land can limit the funds available for construction and other expenses.Development Scale: I’d recommend avoiding developments in the range of 4-50 units unless you have a very specific reason.

You could use a floor leveling product but check the square feet to see if the product covers large spaces.

How much do they sell for?

You’d be shocked by how little actual screening many PMC’s do!