Are there property managers that specialize in these kinds of unusual properties?

I have solid knowledge and hands-on experience in construction, including full kitchen and bathroom remodels, hot water heater installations, and pretty much anything that doesn’t require approved plans or specialized licenses.  

Do you have any special tips on moving forward to get them out the property after his lease is up? 

Depends how you want to pay out. there are a lot of national syndication attorneys that can help and it's actually helpful but I think you should treat it like anything else. get 3 estimates and speak to 5 people, see who specializes in your strategy.

Your specialities are great for this community of investors!

Enter the checkbook IRA, where usually a special purpose LLC is created that allows the IRA owner to bypass the custodian for all transactions and investments making it a much more efficient way to invest.

If you are wanting to maximize depreciation you could talk with your CPA or someone who specializes in cost segregation studies.

Also are there any GC that specialize in quadruplex construction in the Atlanta area?

Consider offering incentives like a move-in special, free first-month utilities, or flexible lease terms to attract tenants.

I recommend finding a US-based bookkeeper who specializes in real estate and doesn't have too much on their plate.