 Initially, future expansion of the building was not foreseen, however, the admission of the craft guilds into the traditionally patrician city government apparently spurred interest in providing more room for the building.As a result, a second, somewhat longer wing was built on to the existing structure, with Charles the Bold laying its first stone in 1444.This west wing was built by Guillaume (Willem) de Voghel who, in 1452, also built the "Aula Magna" at the Palace of Coudenberg.