The building regulations maintained the country's pre-existing architectural features and balanced the rapid urbanization. Nonetheless, while this policy preserved historic monuments, it also had other consequences in the long-term by stalling urban development in these heritage areas and causing housing shortages in some areas. It also suppressed local Moroccan architectural innovations, as for example in the medina of Fez where Moroccan residents where required to keep their houses – including any newly built houses – in conformity with what the French administration deemed to be the historic indigenous architecture. Scholar Janet Abu-Lughod has argued that these policies created a kind of urban "apartheid" between the indigenous Moroccan urban areas – which were forced to remain stagnant in terms of urban development – and the new planned cities which were mainly inhabited by Europeans and which expanded to occupy lands outside the city which were formerly used by Moroccans. This separation was partly softened by wealthy Moroccans who started moving into the "Villes Nouvelles" during this period.