Nope 
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The American geosciences institute seem to disagree with you :
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It could be wicking all the way up from the basement. Were the walls finished?
And, did you determine where the Condensate was draining?
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Capillary action is a strong force. If you put a bucket of water on the ground and an empty one in a tree and put a piece of rope in the water at the lower bucket it will eventually transport the water into the bucket in the tree
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Nope. There was foam board insulation behind stud wall and flooring was carpet on a raised floor . There was no visible signs of moisture on wall nor floor.
Condensate pump discharging in laundry tub which was connected to the sewer.
From the article you provided
"The source of almost all of the water supplies for human civilization is rainfall or melted snowfall. When rain falls on the land, it either runs off into streams and rivers or it soaks into the ground to become groundwater. The groundwater flows slowly underground, and eventually comes back out to the surface at the beds of lakes and rivers and carports"
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You’re funny!
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Brian is part of the
Crew.
Sorry couldn’t resist
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I am just having a go. This thread is great because it brings in so many possibilities which are all plausible and should be considered when evaluating this sort of phenomenon.
I am not advocating wicking over any other comments made. I sincerely just do not know conclusively. It is just one of many possibilities.
However, here is a fantastic article about moisture wicking and masonry foundations.
Frankly for all any of us know there could be a high water table in that area. There really is a variety of possibilities. It’s an Inspection crimescene. At least you didn’t find any high moisture meter readings or damage “at the time of inspection” hopefully you state that kind of thing in your report and document your observations.
It could be from some chronic water issue from the past that was resolved.
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That the efflorescence is concentrated at the driveway interface is an important clue. Water is either pooling on the interior of the concrete block at that point or it is pooling at the exterior. If that is a basement and there is no evidence of water penetration, then that would point to the source being from the exterior, either immediately above of below the driveway surface is the most likely.
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Cold weather climate? Could be from vehicle exhaust if the person warms the car in the area causing condensation.
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That may be the best guess yet. It would explain the odd staining on the brick too