"The number of buyers is rising unstoppably," said Paris notary Thierry Delesalle.
Demand was outstripping supply, particularly for the most select properties, "and perhaps because of Brexit," Delesalle said.
While Italians were the biggest group of foreign homebuyers in Paris, snapping up 17 percent of properties sold to non-French buyers, Britons came second, accounting for 10 percent of such transactions.
And they could rise even further to 8,800 euros per square metre in July, the survey suggested, based on preliminary contracts prepared for signing.
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The previous record of 8,460 euros per square metre was reached in the summer of 2012.
Real estate prices in Paris had seen "a slow erosion in the past three or four years," slipping to 7,880 euros per square metre.
In the city's most well-heeled districts or "arrondissements", prices have risen to more than 11,000 euros per square metre, the notaries estimated.
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