The school boards monitor property sales closely: in your example of a house selling for materially more than an appraisal then the schools will request a tax reassessment.When I’m doing my due diligence I always assume that a) taxes won’t go down even if I buy at a discount; b) taxes will immediately reassess in the first year to the new price, which has happened to us on most purchases.Note there was someone on a bp podcast who created software that auto-populated the forms needed to challenge the assessment.

I have been monitoring comps like a madman in Metro Atlanta.

Department of Housing and Urban Development (HUD) to monitor and enforce states’ compliance with the statute’s requirements for state licensing and registration, and HUD issued rules setting minimum standards for state licensing and registration. 76 Fed.

I was monitoring for few months Multifamilies in South Florida.

Because you get automatic alerts to your phone if it gets too loud (and you can set hours & noise levels), it's a lot easier to monitor than a camera system. 

I'll definitely be monitoring prices moving forward but I think we are hoping that prices may go down and mortgage rates won't jump up between now and when our lease ends.

Not that I'm aware of and most likely if it existed they will charge a fee :) The closest I can think of is monitoring payments on Mint.

The police know where fenced merchandise is often taken for resale (craigslist, Ebay, and so forth) and have officers monitoring these sites.

I also lock exterior A/C circuit boxes and label the units, cage and circuit box with A/C specific alarm stickers that I had made up.I will frequently install an inexpensive alarm system (not monitored) which gives me peace of mind between tenants and acts as a selling point when showing the units.I've doubled up on door stops (to prevent doorknobs from going into walls).

I am not plugged in to those things yet, but am planning to monitor both Harlem and Thompson for new development proposals.