It can come down to what you want/need.
There are many fairly good systems.
This is a general response, naming attributes, based on your post and what I would want personally:
-Monitored, police response
-motion sensors in appropriate areas
-cameras both indoor (public areas) & outdoors - motion activated, records to cloud, holds for minimum 48 hours, w/ audio capability
-remote light switch control
-remote alarm mode settings : on, off, at home
-remote lock / unlock entrance
-remote doorbell camera (service, delivery interaction)
-temperature & flood sensors around appropiate areas
-alert capability (various) set for your concerns
-ample exterior motion dection led lighting, some solar powered lights that illuminate all night
-phone app that you are comfortable using
There are more attributes I would want but I'll stop here.
Some of the above fall under home automation and it is directly related to security.
There are a good number of systems that achieve the above.
In my humble opinion, technology should be a landlord's/propery manager's best friend. The abilities, including view inside & outside, along with other information provided can keep a property much more secure and give the human counterpart peace of mind.
I'm in Chicago too. If you have any questions feel free to contact me.
