I think @Trevor Kolb made great suggestions but I would also add a TV, you don't have to have cable or satellite necessarily but definitely at least a Roku or something similar. 

The wires have ground in them, and they run all three cables (hot neutral and ground) inside the same wire.

They hear a story of the landlord working with someone else and think " I do not have enough for the cable this month.

Install safety cables in the springs of one of the overhead garage openers.3.

Tonight saw a place that the current tenants were obviously stealing cable.  

What cable package do you have?

They do offer internet and cable included in the rent though. 

Depending on the area you may be able to fetch more for this property, but that depends on a lot of factors as I'm sure you probably know.As for the other costs that you are including in your estimate, I would not offer to pay for utilities, nor would I offer to pay for cable and internet.

The rent on the other 3 units paid my whole mortgage plus my utilities and cable/internet bill.  

You need to find out how each unit is addressed by the tax assessor's office, post office, electric, water, cable, phone etc...For example I have one property where the mail goes to 201, 203, but the water and sewer bill goes to 201 #A and 201 #B, yet the power company has two meters where one meter is attached to "201-203 North" and "201-203 South".