Just do not make stuff up or otherwise claim an environmental disaster unless you are willing to disclose what you 'know' when it comes time to sell.John Corey

The last one I still have is a property that was used commercially as a bar and gas station that unknown to me may have environmental problems.

I know that gas stations present potential environmental problems and Phase I report is a must.

It's unfortunate but hopefully people will eventually become more familiar with solar panels and understand the savings and the environmental benefits.

In the examples you provided environmental issues are caused possibly even health risks, I never heard of a bandit sign that killed somebody or put a hole in the o-zone layer.

Be sure to find a good environmental consultant to perform a proper asbestos and lead survey before you start the work, as you want to ovoid huge fines, even jail time, and lawsuits by tenants exposed to A or L.  

How do you get a guest estimation for an initial lot count, do you figure it of a 10% 15% or 20% land loss to environmental, road ingress/egress, then divide that by the base zone (the per lot minimum) / total available land ?

Environmental changes and how it is effect to country's  financial and social life.......!

This includes inspections, environmental Phase 1 (possibly Phase 2), attorney fees, bank fees, etc.

Three words: Environmentally Critical Area.