Sailing events could be hosted in Kiel, which won a referendum on the 2024 bid at the same time when Hamburg narrowly lost one.[35] Suitable athletics stadiums are found in Berlin and Munich with their former Olympic stadiums, however, there have been challenges to find a venue for track and field events in the bid cities. There have also been suggestions of temporary stadium expansions for up to 50,000 spectators, which would be dismantled after the games or decreased in capacity for domestic use. The only prospective option is the expansion of Rhein-Energie Stadion, the home stadium of FC Köln, from 49,996 to 73,000 seats, giving it enough capacity for the athletics competition.