Buy an inexpensive video camera and use it during the evenings when not working on the property.

Not sure it could be done with just cameras although that would be one of the first things I put in. 

We knew we could keep cameras up at all times, so it made a lot of sense to us.

We considered cameras for about 2 minutes.

I sacked all of mine and now self manage.A reliable & honest contractor is the most valuable member of your team.Security cameras (multi family) are worth their weight in gold.

Don't put any fences, cameras, electric there (make the numbers work); unless it is very cheap for electric/camera/internet. 

Take a Picture with a digital Camera of the front of your new client’s home!

Would also be a great thing to have for a vacation property.The wifi security camera system I like is the Y-cam, mainly because it's the only one I know of that stores your files on the cloud for free.

Install a camera system to watch over the room.

You also need enough storage on the NVR to hold minimum of two weeks CONTINUOUS recording of all/most of the cameras (motion activated only cameras tent to miss a lot of critical views).