Security cameras.

I am thinking of installing trespass-proof gates (currently it's just a chain linked fence) and I am thinking of hiring a security company like SimplySafe of Vivint (currently I just have a self-installed Reolink and the cameras are cheap and not always functional.

They ran the camera and there are multiple leaks throughout the home.  

The prior owner is currently installing additional lighting and security cameras.

Why doesn't a plumber run a camera into the drain and pinpoint where the break/leak is before you bust up and slab or start digging in the yard? 

If you're going to buy an old house on a slab, see if you can get a plumber to inspect the lines with a sewer camera.

Hi Rosie, I’ve used wireless trail cameras on my properties for security purposes, with good results.They immediately send you text or email photos when triggered.  

We trimmed and cleaned up all the trees, added light for safety and esthetic purpose, remodel the empty units inside and out, added security cameras, new laundry room and equipment, new fences, new signage, online marketing, increased rents (that were way below market) and added new tenants.

For example, a lawyer would never put "Tenant assumes responsibility for plumbing costs deemed to be tenant's fault", but that would allow me to send over a guy with a camera to find their kid's pencil crayons and leave the bill for the tenant - thus stopping future calls of this sort, as they'd probably rather pay for a guy that doesn't bring an expensive camera.

Run a camera down the lines...give a plumber a couple hundred bucks to do it.