Highly selective crypto- for those that purchase, now.Best market/worst market-Too early to tell.

Flip side to that coin: If the parents gift the property, it will have their carryover income tax basis.

I had the idea of buying two big, 16 inch clear glass vases that they can put coins into, one for saving and one for spending.

We saw the 7th worst year on record for stocks, people got wiped out with crypto, maybe commodities.

They are mistaken, but I would like to find out how to do this right for them, both to enhance their quality of life, and to enhance the value of the property.My preferred plan is to install 2 sets of coin operated washers and dryers.

Do you guys have coin operated laundries in your rentals?

@Alan FordMaintenance, or Capex, is the other side of the coin of depreciation.... it runs about 3% a year of your purchase price in order to maintain the value of the property.... 

Remove anything that involves cash as well, if you have a laundry room or vending machines switch away from accepting coins in those to only doing card or app transactions. 

There are other (Non RE) passive options (Stocks, bonds, mineral rights, crypto, etc) with various levels of risk/return. 

This actually did happen before, and people used that leverage, so much so that a phrase was coined from it; Strategic Default.