I was discussing the idea of a sky scraper standing between 62 and 65 miles tal so spacecraft could be launched from it. I mentioned that the common wisdom was for a building that tall the base would have to be of equal square distance so the building would need to be a little over 8 miles squared. My brother said the one flaw with this topic is therer is noplace with large enough bed rock to support the building of that size. I thought the 8+ square miles was the equation to cover the lack of bed rock. Am I right? Is this lack of bed rock something an engineer could work around?