Investors use LLC's to mitigate risk believing by having one, they're personally off the hook, the LLC gets sued instead.

If s there are headaches, is there a way to mitigate landlord expenses with such a system?

Or is there a way to mitigate the cost?

Just takes a better team in place to be able to mitigate the risk. 

Now that Cozy.co has mitigated to Apartment.com, a division of Costar, I no longer have the right to manage my mobile home properties with them.

If you're going to make a substantial amount of money from selling a business, it's generally a good idea to pay for a consulting session with your tax advisor to hear about what your mitigation options are and come up with a plan.What you're asking about is just one option out of many, and it isn't always feasible (or enjoyable for your spouse).

I am planning to sell and use the proceeds to purchase a rental property but want to know if I can mitigate my capital gains tax liability.

I will add that I've never looked at a small project like a 4-Plex to have built as new construction because in my targeted areas of investment which are Washington, DC, Orange County, and Los Angeles, California, it's always cheaper to buy smaller properties in these areas unless you're going to build larger apartment buildings, and get the government subsidy's to mitigate cost.   

The way you construct the building, how high it is elevated, what is in the lower levels, does it have flood mitigations like breakaway panels, etc. all will impact the eventual rate for the Flood Insurance in the National Flood Insurance Program (NFIP).  

This is why you have to mitigate risk and plan on the worst but hope for the best.