Tech enabled homes, for example. Converting malls into homes, and managing building complexes using a tech stack...
If you really can't figure out one single use for cheap empty space, man, you need take a step back and just play around with your imagination a bit :)
Considering that there will be a huge amount of unused, cheap real estate, and that only tech companies seem to be holding off the crisis, it is pretty much relevant - real estate will be a huge opportunity for tech.
Any long lasting civilisation had people that were relatively clean and well fed - that's a very fundamental requirement for the civilisation to last long, after all!
You will find that even older civilisations, such as Egyptians, ancient Indians, Mesopotamians, etc. all had a relatively good nutrition.
Cleanliness here is extremely relative, though, as modern standards of cleanliness were revolutionised by fresh water supply and sewage systems. If any modern person visited an ancient city, they would have some trouble dealing with the stench.
Italy is the largest political mess of Europe, and the amount of structural problems is staggering.
Its industries kept it running, and China's growth as a manufacturing centre, together with the accession of countries with less structural problems have taken a toll on the Italian industry.
If there was no Euro, Italy would still be ruined anyway.
I'd much rather to see someone putting crazy ideas into action having money...