It's not just accounting, it means enough things that they're incentivized to manipulate it upwards. It impacts the loans they can get and the interest they pay, enough that it may be worth it to forego some actual income to keep the fake numbers up.
And they’re often owned by funds that are measured in the billions. A parking lot in New York covers for a bunch of empty middle America storefronts, as long as the valuation works out on paper.
But at some point it has to collapse, it seems to me. You can't forever fake a high value on a property that is bringing in no rent. Unless the real value is just being a outwardly legitimate-looking place to park money.