So the population is very compact and since it is so old, very hard to find open land near population areas.     

Housings in Atlanta is really expensive but its because all the jobs are compact in that area as well, so many people who work in Atlanta live out side the perimeter (OTP) to balance income to mortgage.

Looking for a good source to estimate construction costs, land fill, compact, foundations, framing, electrical, sheet rock, plumbing, cabinets, paint and finish

The soil below the footing will need to be tamped and packed or over excavated and re-compacted to likely a 90% dry density so you are not being paranoid.

And that's only if I'm ok dumping in ALL the cash we'll get in selling our house (leaving just enough for reserves).In general I think there has been a "compacting" of prices where the less expensive properties have been outpacing the higher priced ones as people end up shopping down market from where they would have with lower rates - Hell the house we are selling in Del Sur I wouldn't buy today, monthly payments would be like 2x what we pay and we only bought it 2.5 years ago!

The OI district is designed for use on sites that have convenient access to arterials, since development of moderate to high intensity is allowed.The OI District is used to implement the Comprehensive Plan within those areas shown as part of the Rural, Suburban, Urban, or Compact Neighborhood Tiers.It looks to me to potentially allow/support residential development. 

Like medications, toothbrushes, if you are looking for long term stays, they are “moving in” For the front a welcome sign, mabey with the name of the house?

No Fines, then the surface won't compact, and rocks will move around.Rolls covered far more distance than I thought due to the light weight.You can't tell but the ground slopes slightly to the left towards the ditch.

The problem is I see very little comp activity in that area.

Electric Compact Dryer in White-DCVH480EKWW-$704 GE-2.2 DOE cu. ft.