Even so, I would create an addendum to the lease that indicates that the tenant is responsible for maintaining the equipment, paying the monitoring fee and uninstalling it when they vacate.

I would just turn it over to collections, they are better equipped to perform a skip trace, and it is unlikely you will collect any of it anyhow.

Landlords: can/have you deducted the cost of equipment used to repair your apartments from security deposits?

It's also important to teach tenants how to prevent clogged drains, how to shut off the water and natural gas, how to keep water from going where it shouldn't be going, how to keep the safety equipment working, etc. 

Yes, there are costs in establishing, equipping, furnishing, supplying, and staffing a business that could be considered startup costs.

The owner is a neighbor & a good friend so when he wanted new equipment financing he showed me his (real set) of books.

This is the best time to organize, train, and equip a coalition of the willing to take action when the market melts down....

CARPET CARE.Tenant agrees to maintain carpet with regular vacuuming.If liquid is spilled on the carpet, Tenant agrees to immediately blot the spot with a clean cloth and to consult with Landlord for further cleaning instructions.Tenant agrees not to use carpet cleaning machines that add water to the carpet, as most consumer equipment can not adequately remove water that goes into the carpet and more damage is likely to result.""

The ones that take the time to educate themselves FIRST, shadow those who have succeeded in this business, read books, go to networking events, and after properly equipping their mindset; get their first deal.This is by no means me venting or even a means to plug something.

Anyone in the radon mitigation business will have a piece of test equipment that they will place in the property at the right location.