So, she started smashing furniture, smashed windows and threw my computer and monitor out the window.

Welcome, I have family in Visalia and monitor RE there.

Or you just hire them assign work and monitor.

Monitor the pit to determine that the sump pump is not constantly running.

But I don't monitor it today.

Does is makes sense for use as a landlord to have a security system installed to monitor each of the 3 units or is this something we should leave up to the tenants? 

TV software, servicing companies, First Nat Acceptance, Marc Gold has a new service that will handle all aspects including tax monitoring, title curative, foreclosure etc.  

I was leaning that way, but I'm not able to monitor the project or have a good enough handle on the repair costs to know whether or not I can get my money back out with a refinance to go out and get another place and cover the HELOC.

If so, you’ll need a way to monitor their performance. - annual and turn-over inspections: your handyman can do these with proper direction and a checklist.

I've had a basic security system installed, and the first 12-months monitoring is included in rent (this drops on renewal or for the next person -- a built-in $25/month rent increase for me :-).