I sort of remember in the 1980s there being a mention that perhaps some skyscrapers will extend into outer space and could be used as launch platforms for space craft to visit Mars. I think the theory was that a craft would either launch from ground to pick up its crew and provisions by docking with the top of the skyscraper or it would be built at the top of the skyscraper and depart from there. I cannot remember where I read this.