Overbuilding certain features can lead to diminishing returns, especially if they don’t resonate with local buyers.

The commercial loan should go on your personal Sch E of your tax return too, if the property is used as a rental, where the mortgage interest paid will show.

If an asset is throwing off a certain yield that is not commiserate with it's risk, then investors will then begin paying more for that asset, thus decreasing it's yield....or start paying less for the asset which would increase it's yield, until it was at the proper risk/return rate to produce the yield that is truly reflective of it's risk.The problem is novice real estate investors get the risk/reward correlation backwards.

Most of the material used comes from non U.S. friendly countries. 

So Doorvest is getting everything that produces a high return and you get the aspects of real estate investing that have low a return. 

The Norada Capital promissory notes do offer a high rate of return (interest), but I would not classify them as "high risk" because of the higher interest rates.To correct your comment, they ARE backed by hard assets and collateral.

With the idea of "we can turn money today into more money tomorrow by investing it," I place most of this within a taxable brokerage account where it grows based on the market broadly speaking.

Calculate expected returns, costs, time commitment, etc.  

It's good that you have thought about this, but its really a non-issue. 

If you’re confident managing more complexity and have the funds, a small multi-family property could yield higher returns.