I don’t know what it is, but it seems commercial landlords would rather have an empty property than accept market rent in a down market. I saw a lot of that in the last recession.
I suspect that the managers of REITs and partnerships that own most commercial property worry that accepting lower rent would make it harder for them to delude their investors into thinking their property values haven’t tanked. “We appraise this property based on a rental income of $5k/mo, it’s just between tenants right now”
I think it's sometimes because they see the value of future higher rent after a void is worth more, in straight up cash value, than accepting lower rent with a long term commitment.
I've seen it for years: Empty shop buildings, a glut of local businesses wanting to rent them, but they are kept empty until some chain willing to pay double turns up a year later. For the landlord, it's worth waiting if that will be the outcome.
They have had 0% success and the only response is really that rent is due on the first.
There will be a massive commercial real estate crisis soon.