You could develop the park with SolarRoadways developing road surface technology.  

The hypothetical scenario is:I purchase a plot of land on a dense city block in the year 2000 for $100,000 and use the land to operate a surface parking lot.

It seems on the surface to be maybe not a good idea.

On the surface it sounds like it's worth looking deeper into.

On the surface, it seems that renting the house out will become "more profitable" than selling after year 5.

Don't just scratch the surface in finding out what the Seller's wants & needs & hold backs are.  

While bleach is effective in killing surface mold, it doesn't kill the roots of the mold.  

As referenced earlier, Dallas may not seem attractive on the surface, but both Houston and Dallas are places that I've lived & both are currently very active.

It is lightweight, non-toxic and is commonly used in drainage applications such as residential gutter run off and DWV.

.- For retrofit work of this type, some companies may just install small drainage components of various sizes and styles, while others may also add coatings to the block wall.- Generally speaking, in my opinion, interior measures are a last resort as I prefer to prevent water from breaching the building envelope.- Water problems in basements may stem from different sources such as the water table, underground springs, or simply poor exterior drainage details (e.g., sloping the grade away from the house, making sure gutters and downspouts are in place, sized appropriately, in good working order, and do not terminate near the house - they should discharge some distance away).- Prior to taking on an interior retrofit, I'd exhaust exterior measures first - sometimes, that's all it takes.Good luck!