Made me sign up for a re-occurring pest control service at my expense* Got a new refrigerator as old one broke* AC went out few times in summer and they would not wait for home warranty to schedule service.

Seems to be a reoccurring thing in our area.  

Then, monitor those listings over time and see if they are still listed or if the listings are pulled.  

Richard: Corelogic provides host of services for mortgage servicers, on of which is monitoring of real estate taxes so that the mortgagee doesn't lose its interest by virtue of a tax sale.

When tenants do disconnect them it is surprisingly easy to catch them as many take the entire detector down and never put it back while others remove the battery and unplug the detector.Our insurance company frowns on disabled smoke detectors  - not sure if they would use a disconnected detector to deny/reduce a claim, but I prefer not to test them.We are experimenting with a new detector which we can "see" with our building monitoring system.  

More information here if you're looking to get keywords out of GA.https://www.wordtracker.com/academy/learn-seo/analytics/monitor-with-google-analytics

We've got about 250 that we rent out and though your cash flow is higher, the maintenance and turnover expenses can get out of whack unless you monitor your team carefully or have a very good property manager.

I built and sold 3 successful tech companies, was a CTO for two top US firms in DC as well, so let me play Devil's advocate — AppFolio and Buildium both offer reoccurring task/maintenance features for tracking such items like filters, law care, etc., however a simple operations change will fix all these issues.

Property managers may also implement a wireless toilet usage monitor.

So for now, think I'm gonna keep it, and monitor the callbacks for use.