I’ve just MOSTLY retired from my W-2 job and I’m working to cut my living expenses.

Try not to cut into your savings or your retirement accounts.

We are building Hydrogen Fueling stations in CA and we lease land from the gas station owners. 

In terms of the math, let's look at return from rental income and return for equity:For each item, calculate a year's return, and there's your approximate ROIFor the ADU conversion: ($4000/month x 12 months)/$500,000 cost = $48,000/$500,000 = 9.6%That's before expenses, which will cut that number down by several points.

This will cut your workload a bit while still getting somewhere between the LTR and STR profits.

They said they could potentially take action if the survey shows the boundary line truly cuts off the driveway.

If I list with them, they are for sure the "exclusive broker" for anything sold thru the MLS, and it's pre-negotiated that the buyer agent's cut will come directly out of the agreed upon price. 

It gets old and I have cut back quite a bit.

If you are raising the rent I'd make sure its cut and dry and is at the end of their lease term, I wouldn't trust that notarization tid bit you got from someone else, if the lease is signed and executed its likely valid through the full term. 

An absolute headache to deal with due to corners cut by the builder (we are outside of the build warranty).