Wilton Palace Hotel was a hotel in Buenos Aires, Argentina. It was on Av Callao, near Av Santa Fe. It showed up on a map at CIA headquarters. (TV: The Blood Line)
Location information
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Though it's possible that a real world location doesn't exist in the same geographic space in the Doctor Who universe, such cases are few and far between. Thus, the map to the right is probably a good indicator of the DWU location of Wilton Palace Hotel.