It didn't "change my life" but it did change my thought process about a lot of things, especially in the finance department.

After a few years of successful operations, you can look to banks' commercial lending department for future loans. 

You might even want to see if the person staying will be assuming full responsibility for any of the damages rather than splitting that up - you might even find that all damages were caused by the departing person and they both agree that the full payment for damages should come from  that share. 

What major  replacements are necessary?

I once went to the heavily barricaded (Clearly post-Terminator I https://youtu.be/kYt2HmAxHL4 ) police department for a property I was doing due diligence on and they were happy to tell me that the subject property 'only' averaged 20 calls a month!

I decided the shrink was right and I made some major changes in my life, including a divorce and - more recently - I parted ways with my employer.  

I’m the majority owner of the new Real Referrals App...

Maybe even attempt to change departments rather then to quit  right away.

After some major growing pains I am right where I want to be, and working with the right people. 

Of course you also want to visit the building and zoning departments to confirm legal use (do not go by assessor card).