My property is pretty well seasoned and I only need to visit once every few weeks and also monitor the property via security cameras from home.

Invest in a good camera and take exceptional pictures of the houses you list.

(We will camera the daylights out of these as well, so we can see what's going on from anywhere.)

The app i use on my phone the most is the camera. 

The sink and tub clogged up again on that day, so I called the city, they came out that day and ran a camera and found that it was clogged on their side, the next 4 days they dug up the side walk, my yard and the street, replaced the pipe on their side and fixed everything.

Tell them to bring their camera, tape measure, mother in law and whatever else they need to make a decision but its too much to ask of the current tenant for a prospect to have multiple showings of an occupied place. 

If you want security cameras and motion lighting just by a little shed with solar panel on top so you don't have to tap into the utilities. 

The third attempt was thwarted by cameras watching the units.The problem is that condensers are usually put out of sight, which makes them easy prey on an empty house.

How there happened to be someone there with a camera I don't know.Check out foreclosure.com.

Then, they wanted $20,000 to furnish and install 24 hour serveilance cameras and special locks and build two separate patios in the back with barbeques etc.They would decide on the inside paint etc. that they thought would be best.