cœur

OBS: [Comme] la tendance est [...] de prévoir des villes [...] de grande taille[,] on admet que les centres urbains nouveaux qui en constituent le cœur, doivent être conçus [...]

OBS: ... because, in the central nucleus, the density of residents is already about 30,000 ... most of the new development would have to take place on the peripheral ring.