Headed by brothers Jonathan and Samuel Haiun, Grand Paris Groupe has acquired the building at 3 rue du Pôle Nord, in the 18th arrondissement of Paris, from a family joint-ownership group. A value-add operation aimed first and foremost at "bringing the building up to energy standards before launching marketing", confides Jonathan Haiun. To this end, all the apartments in this 600 m² building will be upgraded to class B or C.