Best security camera system for a 15 unit apartment complex

[Jon L.]

We're considering putting up 1-3 cameras for our rectangular shaped apartment. It's 2 stories, with 15 units. 

The parking lot is out in front and we'd like at least one camera to see who is coming in and out since lots of them allow friends and family to stay over for weeks at a time. It's also a deterrent. They also block other people's parking spot or park in someone else's spot a lot. 

Is it best to just sign up for a local internet and install a Nest Cam or two or is there another way to do it cheaper? I'm looking at about $50/ month for internet and maybe $10 a month for Nest monitoring. If I were to get internet, I'd probably put the router in the back laundry room which is 200 feet from the front of the building.