A most unusual excuse

Following up on the feedback on me buying a flat. Today I heard the most unsual objection. It goes like this: German: "In Germany when we build houses we always dig up some war remnants and therefore any building project is stopped". Me: "Somehow I don't think that'll be a problem here in Zürich". German: "We also very often run into Roman ruins". Me: "???" German: "Yes, Cologne used to be a part of the Roman empire and we have lots of flats where Roman walls are preserved in glass walls. Sometimes within a flat". Me: "Hmmm". Thinking about it. The odds of finding a Roman wall in my building site is on par with the odds of me winning the Euromillion lottery. I just have to figure out which one I'd rather have...