Landlords have the right to inspect simply by giving proper notice as outlined in your state landlord tenant regulations.

DISCLOSURE: I am not a lawyer and this is not legal advice.I wouldn't think this would be considered discrimination since it is not targeting the protected classes outlined in the Fair Housing Act.

I would highly suggest outlining and documenting (on paper) your policies, procedures, and core values for your investment business. 

I found the stake and tire tracks from the middle of my driveway in the middle of my property to the edge of "her" landscaped area with a bunch of boulders outlining it to prevent me from mowing.

Any kind of quid pro quo arrangement such as you outline, the IRS would see right through that as a scheme for you to get access to your own IRA money. 

Now it could be that the those three lots are way overpriced at $170k, but a recent lot sale one block to the east (in yellow outline) that did have some prep work already done (stacked stone bridge over a culvert and the lot was cleared) sold for $225,000 a few months ago.

Make sure you send one certified, and if they fail to leave at the end of next month, then do the court thing as outlined before.

However, this particular request of mine for help (window trim) was not listed in the outlined restoration work.

Anytime by choice (or as outlined in the lease).

Serve 3-day to Perform or Quit by registered mail which outlines the violations (not the emotion or inconvenience caused to others).