Honestly, I'd be surprised if the cost of legal action (if it goes to trial) is going to be cheaper than just getting the permits sorted out for a MFR or converting back to SFR. 

You don't want to be the person that the bank uses to "trial" SBA loans.

Was wondering if anyone has a remedy or experienced any trial and error ways of getting rid of it?  

There can be huge variations.

Some variations exist depending on property type and the info you posted makes it look like a solid deal but here's the MILLION DOLLAR question..... 

WEAR A RESPIRATOR WITH ORGANIC VAPOR CARTRIDGES.The new stuff will usually blend well enough into the old stuff to pass muster, especially on a parquet floor with all the variations in shading.

I believe they have acquired this through experience and talking with contractors, mentors, and just trial and error.  

Finding the right people can be a trial and error experience, but it's worth it in the end.

I follow a minor variation of what was suggested by above by @Paul Sandhu in that I don't do deposits and I charge a combined cleaning and damage waiver for all guests.  

I can understand how with multiple properties you'd not want to be calling all the owners with requests for $ variations for time/rates.