As most investors seek to do in real estate, we want to generate positive passive income through multiple avenues such as equity, cash flow, and even tax advantages.  

If any of your properties are discovered by City officials to be unregistered, you can receive an administrative citation for failure to register; this penalty can cost $100 or more per property.

If the tenant does not keep the basement clean to an extent that it might be attract mice.The contract does not have any explicit language stating "Failure to do so will results in penalties or such and such...".I dislike sending multiple reminders.

I was able to sell the SFR for $62,000 with a wrap around $50,000 mortgage at 12% interest and a pre payment penalty if paid off before 10 years.

Readers should seek professional advice.

Readers are advised to seek professional advice. 

Most of her Chicago landlords do not charge a deposit since the anti-landlord penalties can result in paying triple back to your former tenant for some minor infraction.

The challenge for many of us seeking to replace our W2 income is coming into it with a serious financial deficit: bad or no credit, little or no savings (left after the crash, unemployment, divorce, health issues, etc. or any combination there of), sparse personal network, ...

I'd also recommend diving into books, podcasts, and even attending real estate events to start learning more.Here:Learn the Basics: Study property types, financing, and market trends.Network: Attend events, connect with pros, and build relationships.Find a Mentor: Seek guidance from someone experienced in commercial real estate.Start Small: Look at smaller deals or partnerships to get your feet wet.Take Action: Once ready, start evaluating deals and making offers.

I am not seeking to charge each tenant, only seeking to remotely monitor each buildings water usage to identify costly waste/problems early as possible.