Access roads and if multiple are needed for each unit.City regulations and zoning.Impervious cover requirements or percentage across the whole lot.Drainage per units built. 

I have been working on numbers and building a road map for such a project. 

It should be matched to their application and their credit/criminal background check.Here's a detailed guide on how to screen applicants: Application Screening Guide

I looked into RealT and it seems it could be OK for passive investing but it seems difficult to sell later down the road - seems there is not much liquidity. 

please reply with actual law codes if it’s criminal.

I am local to Hampton Roads and would be more than happy to connect.

They actually tell criminals the property is vacant.Alarms only work if the police show up quickly, otherwise the thieves are already gone.Appears you have properties in Class C/D areas, there are several other options that we use to minimize breakins & squatters.

Last month Atrium Health purchased 40 acres a mile down the road. 

You don't want to open yourself up for issues down the road in a damp basement with mold/etc. 

If you can show / prove to him that the park will be worth more because you are rebuilding the bathhouse, paving the roads and adding a playground then maybe he will feel more comfortable?