As an alternative, you could be creative and do an impervious pavement, if the soil can handle the percolation rate...

The walls were plaster underneath it so it was a little work to remove everything.  

The most recent mortgage rule change that has yanked the welcome mat from underneath first time home buyers has put the spotlight on Posted Mortgage Interest Rates.The Posted Mortgage Interest Rates used to serve just two purposes.

Why would it feel hollow underneath? 

The inspection revealed both intact and particularized asbestos underneath the house and in the closet which houses the old/decommissioned furnace. 

How tall and wide the house is makes a difference and how much support it needs underneath to move in the first place.If you have to go across old bridges with weight limits, around a bunch of tight curves, low power lines and traffic lights that have to be lifted, street trees you have to work around etc.Distance and what time of day due to congestion house would need to be moved.10k to 30k sounds very light to me on moving costs.

They did not understand what I had written out in a post about a cast iron pipe and walked away thinking that the entire house still had cast iron pipes underneath and it had all failed.  

If a through body color porcelain is used, a chip of the surface exposes a color underneath that closely matches the surface - that's a good thing (not the chipping, but that it isn't a horrible outcome).

First does the land already come with soil analysis?

Apparently the dry cleaners use some chemicals which can seep through concrete into soil.