But when the WTO headquarters issue came up, and Germany made an offer and a pitch to get the WTO to be headquartered in Bonn, the Swiss suddenly realised they were vulnerable and began improving their offers.
The WTO is located in Germany
The passage doesn't tell us where the WTO headquarters are located which the system did not infer.
( z1 be-located-at :ARG1 ( z2 organization :name ( z3 name :op "WTO" ) ) :ARG2 ( z4 country :name ( z5 name :op "Germany" ) ) )