Hi,I'm looking to purchase investment property through a fully turn key company.

Fannie Mae and Freddie Mac make multifamily particularly attractive compared to other CRE asset classes because they offer some of the best terms in the market—longer amortization, fixed-rate options, supplementals, and generally more favorable underwriting.Another key difference as you scale into MF is how lenders underwrite the deal.

Can anyone recommend a fully turn key company they have used?

Quote from @Gerald Yoon: I'm seriously considering purchasing a turn-key SFR (newish construction) with tenant in place.   

Are you looking for turn-key properties or something along the lines of a "fixer upper"?

Quote from @James McGovern: Did the hard money lender not include verbiage to shortcut having to go to court to foreclose? 

That is usually the best "All in one" or proper network to ensure you are using less money down, Getting the Best deal, highest rents, and Maximum ARV potential.The short cut does exist and it lies with building your team/network and Bigger Pockets help creates those connections.

Or trying to get them on board on their own?  

While the risk technically exists, the practical reality is that enforcement tends to be minimal, particularly when properties are well-managed and maintain a low profile within their neighborhoods.Across most major counties—Clayton, Fulton (including City of Atlanta), Cobb, Gwinnett, and DeKalb—rent-by-the-room typically falls under a “rooming” or “boarding house” classification, which is not permitted in single-family zones.

As others have mentioned he probably did it without permits and some shortcuts may have been taken.