From real estate, to cell phone towers, to ATM machines, etc.

Best of luck with the duplexes, those are great cash flow machines!  

My inspector also had a mold license and informed us those mold tests can actually be very simple and somewhat flawed as they come in with a handheld machine that senses moisture or whatever.

Prior to the decline in the larger U.S markets rental homes in those areas have not meet your criteria for the past 10-20 years, perhaps your giving away a time machine with each book so that people in Larger markets could buy rental housing.I have never said your way is wrong, in fact I invest that way as well, but you would have a better chance of seeing a unicorn than you would finding a home that meets "Mikes way of renting" in LA or Vegas, or Chicago.

Then you have the storage, fuel, and maintenance of the machine.

I have two friends here in Dallas investing in D or worse apartment complexes, with low cost per unit, doing a full Reno, then a cash out refi after appraisal, and they seem to be really great cash flow machines.

Perhaps you can convert it into a laundry room and use coin machines (more income).Make sure you have the property inspected.  

You'll learn the answers to questions you don't even know to ask that way and start to learn all the mechanisms behind the machine.

This is also an A neighborhood with C-/D+ property and I have J Scott's book, but he doesn't delve into multifamily over 5 units.Once renovated and updated to 2015/2016 standards with A/C, new windows, new flooring/carpet, renovated kitchens & bathrooms, paint, new decks for upstairs units and new patios for lower units as well as upgrading the laundry room with new or newer commercial grade machines.

I take the handwritten, buddy letters and the machine typed and the offers to help me out of my misery and pay cash in three days etc. and throw them in the garbage.