The only thing that comes to mind are "trail cams" available at sporting good stores, that you can strap to a tree or place in an unobtrusive location.

Are you asking about CAM vs operating costs of the LL?

This book goes through the different areas of commercial property management, including annual billings, CAM reconciliations, percentage leases, gross leases, etc.https://www.amazon.com/Principles-Real-Estate-Management-16th-ebook/dp/B00EPUEA3E?

Thanks,Cam

If there is any element of leasing or CAM calculations, I think you're in over your head.

Schlage BE365 CAM Camelot Keypad Deadbolt https://www.amazon.ca/dp/B001AT97YA/ref=cm_sw_r_cp_api_vrdLAb31J1YEW

I've not used it but Cam is the same person behind findtheseller.com which charges 19.95 to locate someone.

The Fair Housing Act prohibits discrimination based on certain protected classes: color, disability, familial status, national origin, race, religion, sex. 

I have their adjusters as well as Allstate's on body-cam straight up admitting a roof is damaged, but "they don't know why".

What's different about someones housing needs simply because they're attracted to the same sex (or whatever they might do if they're one of the other letters).