 In 1970 the first phase began with the construction of the first 4,156 homes, 98 premises and internal development.Before the start of the construction of Phase 2, the Ministry of Public Works completed the construction of the Barcelona-Terrassa motorway and the third belt, occupying three quarters of the land prescribed for the second phase, on which only 1,216 new homes and 38 premises could be built.The works were finished in 1973 but the city was not inaugurated, under the then Prince Juan Carlos, until 1975.