If they object for inspection with excuses like "privacy invasion" - tell them clearly either follow the lease or get out.

Those items in my experience have owners who will at least stop and be a little more objective to the requests.If you should have seen it, they almost always feel like you are trying to be slick.

The first objective should be to get them out and re-rented but after that I encourage you to file the suit on money due and send to collections. 

They could still achieve both of their objectives (selling the home and providing me with cash). 

Sure, some investors make sizable returns on land and other non-cash flowing real estate, but they also bear much higher risk in doing so.That said, for investments in my Solo 401K, appreciation (i.e. risk-adjusted IRR) is my primary investment objective, while I prioritize cash-on-cash returns in my non-retirement investments.

@Cameron Tope Im making a power point for myself and the main objective is "Charting average expenses for repairs and upgrades to identify what makes sense for specific properties"This going to help me locate common repairs that may have to be done on properties that I'm interested in buying.

Identify experienced people in the industry locally who understand your investment objectives and have a history of working with the type of property you will be purchasing. 

Much of the rest of what you say does not address my objections above. 

Clarify Your Objectives: Let's dive a bit deeper into your reasons for considering real estate investments.

Haven't got prodio so this comment is pure computer science.We normally create an object (aka contact/client/customer/user, call it whatever you please),and then assert (define) each object HAS A attribute, like first_name, last_name, phone, address, ....There's lots of places a contact can be used and it's a nightmare to have this data segregated into different places according to use (say buyer vs seller).