The Ancient Egyptians are known to play switcharoo:or The Great Pyramid of Giza. A bit on the brutalist side but nevertheless a true classic...
King Tut's famous death mask was originally meant for another pharaoh.
Many of his treasures, including the sarcophagus, were meant for another pharaoh.
Even his tomb was originally meant for a noble (most likely Ay) and the tomb originally meant for King Tut was used for his successor Ay (yes, Ay became a pharaoh) instead.
Yes, King Tut's mummification was a rush job even by ancient Egyptian standards.
I would not be surprised if the plot of land where YSL should be built was meant for a different building.