 Hoddle's survey did not include any public squares or piazzas, reputedly to avoid any facilitation of protests or public loitering, though colonial government practice did not generally include public squares other than land set aside for government buildings or markets.The whole town was at first accommodated within the Hoddle Grid, but the huge surge in immigration brought about by the Gold Rush in the 1850s quickly outgrew the grid spreading into the first suburbs in Fitzroy and South Melbourne (Emerald Hill), and beyond.The Hoddle Grid and its fringes remained the centre and most active part of the city into the mid 20th century, with retail in the centre, banking and prime office space on Collins Street, medical professionals on the Collins Street hill, legal professions around William Street, and warehousing along Flinders Lane and in the western end.