The Monsanto Tower () is a skyscraper in Oeiras, a town and municipality to the west of Lisbon which is part of the Portuguese capital's urban agglomeration. Finished in 2001, the 17-floor building is the second tallest in Portugal. Lisbon-based architectural firm Sua Kay Architects designed the office building.
See also List of tallest buildings in Portugal List of tallest structures in Portugal List of tallest buildings in Lisbon
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