I also want to add a camera on the side of my property to record trespassers.

I am looking to install security cameras for my two buildings.

Metal bars, security systems, cameras,...?

Consider getting a camera for your properties especially if they have problem tenants.  

My cost was almost $700 for the snaking and camera work.

We called the landlord to view camera footage and his response was that it doesn't work.

Send a real letter on paper with signature service stating that the line is now clear and any and all issues down the road are at their expenseI would strongly suggest having the line camera-ed to ensure there is no break or sag or any other issue with the line

I told her that she could install security cameras. 

And whoever is looking needs to pay attention to big ticket items - electric (is there knob and tube or a big upgrade required), roof, plumbing (sewer inspection with a camera), septic and/or oil tanks, asbestos, is the furnace working, mold, structural integrity.

I am not sure how you can estimate damage but I think there are some infrared cameras or some technology that can look in walls...might just look for movement so active termites but might also compare density readings between areas of wall.