All you can do is set up a camera at the gate that detects motion and watch it.

Lessons learned--always install security cameras on closing day if the property will be vacant for a while.

I travel a lot for my W2 income so being a full time PM is out of the question but at the least I can help out by video chatting with you for virtual tours, using my 360 camera to build a quick tour, or verifying contractors are actually showing up for work.Let me know if there is anything I can do.

Out in a security camera system at the gate.

Also, I think putting a camera up may help with the theft since it could be happening within the residents of the building. 

Electrician: I would like to install a security camera system based on mainstream solutions.

Maybe install some security cameras and public lighting for the outside area, this will probably discourage him peeing or beating people in public while he is under the term lease. 

You will then have to get a variance to convert into storage. once you figure out that part, buying and setup (gates, parking, roads, cameras. etc)

You need to get licensed plumbers with the proper equipment to first of all examine the entire run via camera, then they can advise you on what can/cannot be done.

Things like CCTV cameras, signage and exterior lighting go a long way with tenants.