brussels toxic fume kitchen drain force european union wednesday switch venue summit brussels less 24 hours leaders due begin two-day meet europa build also know egg open january amid controversy cost evacuate second time week wednesday cater staff take ill due fume suspect leak drain precautionary measure summit take place next door justus lipsius build anonymous 1990s glass stone-clad structure house europe councils open 321-million-euro 378 million europa new build incorporate exterior jumble salvage window frame summit chamber paint psychedelic patchwork illuminate lantern contain several stories offices visible street know locals van rompuy egg belgian former summit chair 20 kitchen staff treat hospital friday eu official say council belgian safety body work assumption wednesday incident due source unclear many staff make ill wednesday highlight summit likely include address british prime minister theresa may 27 brexit plan dinner thursday statement agree 27 friday demand london offer tens billions euros withdrawal 2019 want start negotiate future relationship base free trade pact egg eu summit venue switch noxious fume