Of course building have foundations. I imagine they built a new foundation at the new location, then lifted the building off the old foundation and slowly moved

Of course building have foundations. I imagine they built a new foundation at the new location, then lifted the building off the old foundation and slowly moved it to the new one. This is actually a fairly common thing to happen to houses; less so for large buildings, but certainly not rare. I know several people who had their old houses moved onto a new foundation with a basement within the last 15 years. Also, in the 1960s, my grandparents moved an entire garage several miles onto their farm property. In 2018, the historic Kodak Building 9 in Toronto was moved 200 feet out of the way so a subway station could be built beneath it, then moved back into place on a new foundation above the station. See here for details of how it was done and a timelapse video: http://www.thecrosstown.ca/node/2018 http://www.thecrosstown.ca/node/2018