During the Lamas administration the city grew considerably in population (by more than one third between the 1900 and 1906 censuses) and gained infrastructure and luxury.
In 1900 Lamas authorized the construction of the Parque de la Independencia, a large urban park designed by famed landscape architect Carlos Thays, which was inaugurated two years later.
Also in 1902, the foundation stone of the modern port of Rosario was laid, as works were initiated to clean up the ravine of the Paraná River and to build a new coastal avenue.
Lamas also dictated the beginning of the works for the Central Market, and created the first commission that proposed to build a National Flag Memorial.
In 1900, the municipal administration dictated regulations that allowed for legal prostitution, mandating the inscription of sex workers in a recording office, with the requirements of being 18 or older, working only in authorized facilities, having two medical examinations per week, and keeping an updated sanitary card with a picture, as well as forbidding public exhibition.