The Paris City Council has rejected plans for a new skyscraper on the city's 19th-century skyline — but the mayor immediately rejected the vote as invalid.

The exceptionally bitter vote Monday embodies a larger debate over whether Paris should be a museum city or should be more open to modern architecture.

The council voted 83-78 in a secret ballot against the Tour Triangle, which would be the third-highest tower of Paris after the Eiffel Tower and the Montparnasse tower, often decried as a modern blight on the city's low-slung horizon.

Socialist Mayor Anne Hidalgo is in favor. Some conservative council members disclosed how they voted, which Hidalgo said violated the rules of a secret ballot. She declared its results invalid, apparently hoping for a new vote.