There was a time when to be competitive in this market your best option would have been to pay cash, but with current market conditions I do not think that is necessary. 

It typically takes several years for a building to finish and start generating income, and market conditions can change over that time.

The minimum rate of return you should aim for in a house flipping venture depends on various factors, including the local market conditions, your level of experience, and the specific risks associated with the property.

And than impact on end user/consumer mindset conditioning. 

Owning property in Germany can be a good investment, but it depends on various factors like your long-term plans, market conditions, and personal preferences.

The valuations on them appear to be completely arbitrary and in many instances the company seem randomly selectedWe had one recently from someone else who provided the opinion and the comps were 7 miles away and from another jurisdiction - whereas this property while in a more rural area had considerable sales that could have been used.If you use them to get an idea for property condition I find them to have some value but since they have no interior inspection reports, they are at best just a random guess of the value which could be off by 100%

As I've informed most of my clients, due to interest rates and overall market conditions, Atlanta has become an appreciation-based investment market unless you're implementing a creative strategy such as rent-by-the-room, STR, MTR, etc. 

Assuming the house is in great condition and previously well maintained throughout, then as needed work will probably be okay assuming you have the experience to discern what needs basic handy work and what needs a specialist.

The property had a main house that was in livable condition, but mostly original from 1986.

Are you wanting to rehab the unit to bring in more rent or is the unit in a condition you're satisfied with now?