Brussels’ Hip Ixelles District Lures Affluent New Admirers

Prices rise in the city’s Ixelles district, which has drawn French ex-pats attracted to lower taxes and a higher quality of life

Finicky French expatriates and buyers reacting to Brexit are helping to boost prices in Belgium’s Ixelles municipality, southeast of the center of Brussels.

Rich in 20th-century townhouses and landmark Art Nouveau and Art Deco architecture, Ixelles has seen residential prices soar, says Bart van Opstal, spokesman for Fednot, Belgium’s national organization of notaries, which reports on the country’s real-estate transactions.

Mr....