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Alain Robert, the so-called French Spiderman who scales the world's tallest buildings, climbed Total's skyscraper in Paris' La Défense district on Monday to call attention on the retirement protests
French labour unions were divided about the future of the social movement after the government offered to temporarily scrap a controversial part of its pension reform. plans.
Prime Minister Edouard Philippe said he would make "concrete proposals" on Saturday to end the deadlock with unions over the pension reform.
The lawyers' protest came after a day of demonstrations by opponents of a plan to sweep away France's 42 pension schemes in favour of a single system.
Thousands of trade unionists and Gilets Jaunes marched together against the French government's planned pension reform on the 24th consecutive day of strikes.
Americans are increasingly striking and protesting for economic improvements, with support for unions reaching its highest level in decades.
The government is proposing to simplify the current system, which has 42 different pension schemes for workers depending on their profession. It comes amid crippling strikes by those opposed to the reform.
Delevoye said not disclosing his role was "a mistake" and an "omission by oversight".