Your handling of it sounds like a classic case of Complacency Kills. 

Buster Scruggs is classic!

When we asked them where they lived, they said they lived several miles away, but they rented the (detached) garage on the property next door (which is illegal in Seattle) to store their classic car.

Any new owner not buying for cash will have debt service and it could kill all of the cash-flow.It also sounds like a seller doing one of the classic "The market is crazy right now, let's just list it and see if we can sell it for this crazy price".

The classic answer: it depends. 

We were thinking about a Volkswagon Tiguan, possibly a Lexus NX, or even the classic Greek middle class symbol of affluence, a Porsche Cayenne, for our next car buy.

I rented out the building to a gentleman who wanted to use it as storage for his classic cars that currently brings $500 a month in rent.

All 240 Units are Classic (not renovated), so that provides us with the opportunity to renovate the units with a modern finish this asset class and market demands.

Get a plain, classic set of cabinets like a shaker.

This seems like a classic example of “trust, but verify”.