I understand they are due when the building permits are pulled. 

The snippet you provided is a bit ambiguous which may itself make it unenforceable.I think your goal should be to get a signed doc from the parties to the agreement saying an STR is permitted under the agreement.

Beyond that, terminate the tenancy based on your lease (you should have a clause in there that permits eviction for this kind of behavior).

I have a deal that was presented to me that currently has some mobile homes with permits to expand.

Hi Adam, we do everything in-house from the permitting & architectural to the construction itself, so that removes a few variables.

Because thats about how long it teams to get stuff permitted and built out there. 

"Limited supply due to tough zoning and restrictive permitting process, high construction costs, and expensive dirt, and population increases (guess AI hasn't gotten the memo that population has actually decreased)". 

However, one of my biggest concerns when fixing homes is knowing when to use permits.

The solution is for people to find places where their wages permit them to buy or rent a decent place to live.

I have worked my entire career in construction and last 2 years performing entitlements, permitting, and construction for industrial developments along the Wasatch.