However, I keep my eyes open and occasionally a FSBO comes a long that is a good deal, but not a lot.I actually sold some properties and put that money in mineral rights where the return is stupid high right now and suspect it will last for a few years at which time I'll pick up a few more houses.

The dirty little secret of crypto that it is run by miners.

To achieve R75 to R100 in an attic requires 18 - 28 inches of mineral wool / fibreglass batts or the same of blown cellulose.

The homes are old, but if my prediction is correct, a larger percentage of them will be rehabbed over the next decade.2) Imperial Beach is the cheapest Beach front in the US for at least 400 miles.3) Salton Sea area (probably Imperial County and not San Diego county) due to the minerals that are being extracted for batteries. 

Or selling, paying the taxes, and investing in an oil and gas mineral rights royalty fund?

Billboard leases trailer and RV parksOther types my clients  have done in the past you wouldn't normally think of - marinas, deeded boat slips and racks, mineable mineral rights, Ground leases, hunting preserves.Real Estate is a very broad and fun playground

Are mineral rights included, zoning, etc. 

Person who bought it actually has no interest in the land, but the minerals are probably worth 100x what he paid for it.  

Look at Detroit that is still recovering.For me, the primary thing that makes it investing, whether we are using the term for RE, stocks, bonds, futures, mineral rights, commodities, etc., is that the investor performs research to form their opinion.  

A friend of mine rents a room from a couple who own a few (2  I think) parking garages in Philadelphia, PA.