I've been wrestling with this issue and here are my thoughts NVR in the attic in a steel box. POE cameras with cables coming out of the box to say 4-6 cameras. All this could be done for ~$500
Problems.
Where to get power from? Our tenants are all separate metered which means technically they would be paying for the electric wherever we tapped in.
Tenant could cut the power to the system. Short term solution. A UPS could be included in the box.
Now onto the larger problem, storage and access. I say NVR because they are cheap and store local, I couldn't imagine storing 4 cameras worth of video over the internet.. even with just motion record my NAS starts overwriting at 30 days with 3tb harddrives. That's a LOT of data. + you need to store it on the cloud or on your own NAS.
So we have the data securely stored at the property, how do we access it for review short of going over and physically connecting to it?
Ideas:
Mobile GSM with monthly subscription $$$$
Pay for an internet service and include in the rent $$
Install your own network cables in a way that the tenant must connect the network cable to their router for the internet to work or offer to "set it up for them". (shady)$
knock off a few bucks from the rent so they allow you to connect to their internet. $$
Any other Ideas?