Repeated quick flipping of houses, short term rentals (a services business), certain venture capital and things of that nature will generate UBTI.Passive forms of income such as interest, dividends, royalties, rent from real property, and the sale of an asset held passively over time will not produce UBTI.

I understand you're upset, and when people are upset it's human nature to only see fault in others, and not yourself. 

I am aware that the units would have to become vacant naturally

We were just action oriented and even if we lost money, we treated these units as a mini pension, so when we pay off in next 20 years, it’ll just pay us a steady flow of income vs. us wasting money on consumer stuff since we are natural spenders. 

Unless you're independently wealthy or have a natural way of getting your hands on some cash to invest, I've found this is a team sport and takes a great deal of patience, perseverance, and persistence.What are some of the best ways you've found to grow your portfolio when the money was tight or you didn't have any cash to start with?  

Naturally, pipes burst on a 2-degree day, which was also compounded by the wrong size HVACProblem 4- This really isn't a problem but it reflects some of the BS that gives some contractors a bad name.

Naturally I expected a sphere split to me of 70/30.

@Ruslan NazarenkoHCOL area will also have greater natural appreciation and low cap rates that increase the return on increasing NOI on a commercial property.LCOL area is much more efficient for your money initially.What's right for you depends on 1,000 different factors all unique to you but it will come down to what do you want to do, how do you want to invest, what is your timeline for investing, where do you want to get to, and how much risk is a tolerable amount?

I would like leases to be issued as smart contracts on the blockchain to take advantage of their immutable and instantaneous nature.

If you are naturally good with numbers and analysis, then get good at analyzing deals and looking at financial statements.