Hi Shannon.Property Management fees do change depending on the market and service levels a company provides. 

At the end of the day, as others noted, if it is already built and not taking any additional time for you, great.  

Make sure your contract provides you with permission to market the property, which includes marketing on the MLS. 

Because of common marketing strategies by the industry, their expectation is that a lender will provide a loan at 70%-80% of the value of the asset after its been repaired, upfront.

For example if the rent is $1,000.00 per month they applicant must provide proof of income of at least $2,000.00 per month. 

Seller financed deals provide a lot more flexibility as everything is negotiable.

Check Atlanta's zoning rules for any additional requirements for duplexes or multi-unit rentals.

However, it is important to keep in mind that foreclosures can come with additional risks and challenges, such as property damage or outstanding liens. 

Still, seller financing is usually faster and easier to get than a government-backed mortgage—if the seller is willing and able to provide it.And, while most owner financing requires some form of background or credit check, it can help otherwise unqualified borrowers achieve homeownership.

Never the less, if I was adding an ADU, I would add it with permits etc. to have a legal unit.