I’ve had hot water leaks (you could feel the concrete was actually hotter.) that were caused by interactions with our water/soil/etc. this means if you fix one spot the other 99% is just as bad, you do the whole thing in wall instead of under slab. ($3500-$5500 over the last few years each time.)

What kind of soil/grade?

I dont think you should have to sand these down as paint goes over top of paint. so unless the paint is cracking and its obvious that the underneath needs to be addressed then just put a few coats of paint on them. because your walls are white and your floors are light go dark grey or even black with the cabinets.

Also where utilities are located and any easements needed to tap in for commercial applications.The traffic count on that side of the road and any cross streets will play a role as well.The 2 acres her land sits on might not be as valuable as the Kmart and Target side or it might be more valuable to the right corporate tenant.They have varying degrees of criteria and like different things for different reasons.The more elevations and dips the property has the more it will cost to grade it.Going vertical is mostly the same cost but the grading and other issues to get there is where costs can get expensive.Demoing a house is very cheap and not that much of a concern for a developer cost wise.What does concern them is the city and county architectural requirements to build there,traffic lights,road ways,required retaining walls do to slope issues,soil composition with drainage issues and or rock formations,rivers and streams with endangered species,historical sites or houses,properties next to funeral homes or graveyards,etc.Those types of things along with of course demographics are of a big concern to a developer.If the 2 acres is on the corner or next to it where a pass through from the corner property once built out can be obtained you have good value.The further it gets away from the corner the more it limits who wants to be there and what price will be paid for it.

Saturation of subgrade soils is the number one enemey of all pavements.

Look up "mud jacking"; hole is cut into concrete slab and concrete is pumped into the hole (underneath the slab) to change the level of the top finish.

The buyer had no problem with it.You might be in an area with bad soil where all of the foundations will have problems.

I also had the foundation issues but the bank took care of by adding additional soil for sloping.

I have gone in before thinking just a toilet or a line needs replacing etc. and then you find a much bigger problem after getting into it.New carpet price will depend on quality you use and if you can keep the existing pad underneath or have to replace the whole thing.Lighting fixtures you can always get cheap sometimes on clearance at Home Depot for 5 bucks apiece.

I'm a major gardener so it makes me nervous to plant the poor shrubs out of season, but I know roots can be active until the soil itself stays below 40.