You can tell them they aren't allowed to use it, but there's nothing in your lease or the law that says they can't own it and leave it in the yard as long as it's not damaging anything.Unfortunately, you would need evidence they are using it before you could take action.

My biggest rental concern is that I have 2 very expensive cars that need a garage and a Great Dane that would need a back yard

Like any internship, that might mean doing the coffee run or carrying their yard signs. 

Before you hire a PI go to the property and speak to all neighbors for info as well and what I have done before is put the biggest sign I can in the front yard with my phone number on it stating I want to buy your house.

This is a 3 BD, 1 Bath, yard, and detached 2 garage about 1900 sqft.My conundrum is following where I need your input.Scenario 1:I have the cash to buy and rehab.

In this most recent case, I spent about two hours loading all the junk from the yard onto my trailer (it filled a 16 foot flatbed trailer) and will take it to the dump this weekend.

@Anthony FecarottaCraigslist, Zillow, Yard Signs, Facebook Marketplace.

Then give them a reciept for labor cleaning their yard for $800 

@Lee Bell we get a lot of back yard here.

and many OOS investors look to texas to invest  just curious why you would not invest in your own back yard. ?