@Eugene Lubman Selling the property to your parents allows them to generate passive income while enabling you to perform a 1031 exchange to defer capital gains taxes.

The problem is the HOA doesn't allow VRBO rentals, only year long leases so I wasn't able to generate cash with this property.

While an SDIRA will have UBIT on leveraged real estate, a solo 401k is exempt from UDFI (unrelated debt finance income) generated UBIT.

There are a ton of illegal basement apartments all around Hudson County--maybe 10-15 years ago there was a program (at least in Union City) where many of these apartments were made legal, I think partly as a way for the city to generate revenue, and partly as a way for the city to have some oversight, since people were renting these apartments out regardless of their legality. 

If their credit history is sufficiently long to generate a reasonable score for them then the credit score tells you the answer! 

When I refer to the MLS, I'm referring to the real estate agent generated list.

It is very unlikely that all my properties will stop generating revenue at the same time. 

No auto-generated financial reporting, but owners can generate their own reports through their portals.

You may be able to generate cash by listing it for fractional ownership on lofty.ai.

It's a way to generate more money upfront for them, on top of all of the other fees, and the overall change in payment is usually pretty negligible.