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France has built a field hospital but a lot smaller than Madrid or London:
https://www.france24.com/en/20200324-french-military-field-hospital-starts-unprecedented-peacetime-operations-to-combat-coronavirusand Washington State are building one:
https://www.usnews.com/news/best-states/washington/articles/2020-03-19/workers-building-field-hospital-as-coronavirus-spreadsThink some countries are also deploying naval hospital ships, think one is being sent to LA
Excel centre is absolutely enormous, and also has excellent delivery/loading facilities, as well multiple entrance points, which may come in handy for minimising viral spread.
Remember being extremely impressed with how it was set up during London 2012 (was a volunteer at the time)