If the dumpster and parking have been there a long time, could it be something like adverse possession where you retain the right to keep them in place? 

Adversity that can be overcome builds strength and character.

We are very risk adverse, hence this criteria. 

Are you risk adverse?

An adverse possessor takes the property as their own.When engaging in a real estate transaction in Texas, it’s essential to carefully consider the type of deed being used and the level of protection it provides.

So do they pay the entire price of the house if you lose it to adverse possession?

You should send an adverse action letter to those that you decline.

You may be able legally acquire that strip of land under a theory of a legal doctrine called Adverse Possession.

Currently we have a 78 year old property manager who makes 10% of the rent for doing everying....He is adverse to technology so sharing the work load with him through turbo tenant usage is not possible.  

A vacancy might take a while to fill if it happens during an adverse phase of the cycle.