My questions are: 1) Is this a common concept in commercial properties that the tenant is responsible to repair, maintain, and replace anything in their leased space regardless of the cause?

Sounds like you have some great tenants and I wouldn't worry too much about this situation. 

sounds like you folks need to get a Reciever in there pronto before all the funds if there are any go poof.

Well, this is harder than it sounds especially when you're a beginner because you know no one and have no track record.

It sounds like you and or your agent may not have done your full due diligence.

It sounds like it's a 2% income tax.  

I don't know that Crexi has any information on the owners, just data on multi and apartments.Based on a Zoom call I was on last week it sounds like Crexi is stepping its game up trying to compete in the CRE world.

What a great portoflio --- sounds like taking one of them and adjusting the calendar should be enough of a test.

Sounds like I should open a location there, I would make a KILLING!

It doesn't sound like you need to do anything with it in your market.