As much as 25% to 35% of all Brussels office space is vacant. Millions of square metres are unused, with buildings often even lit up looking like 'zombie buildings' from the outside.

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A prominent Brussels real estate broker, speaking on condition of anonymity, offered a more blunt take: “In large building deals in Brussels, the usual players gather around the table — there’s the smart money, and then there’s the Régie des Bâtiments.”