Legally they are probably allowed to show whenever they want with proper notice.

I’m Gregory, a private money broker at Over the Net Capital.

If this post gets noticed, you may get a lot of people telling you "yes, go for it!"

I'd say it's liveable but definitely noticeably unleveled.  

Settlement shall occur within, or at such other site as the Buyer may select, provided that the Buyer shall have given the Seller at least five (5) calendar days advance written notice thereof.  

You won't get a CO with unpermitted work any other way but for very slack areas, which have all tightened up noticeably over the years.

Thanks, @Derek Brickley - the houses that we used seller finance and private money are in my personal name. - The commercial property is in an LLC, we get K-1s from the LLCs taxes every year showing that the LLC pays for the expense and is cashflow positive; except for the deprecation we take :) I plan on buying a new primary residence in the next 1-2 years and want to know if I need to have the commercial loan adjusted so that its no longer personally guaranteed.

I will send you a private message. 

Husband and I are purchasing a property as our private residence that also has a small cottage on it we plan to STR. 

Quote from @Bob Billingtonz: You gave them the tools, but they refuse to use them.Based on what you've shared, I would give them a short, professional notice that tells them to abide by the lease or give 30 days' notice and move out.