 Despite the area being described as the city "centre", it is neither the geographic or demographic centre of Melbourne; due to urban sprawl to the south east the geographic centre is in the southeastern suburbs (in 2002 is was located at Bourne Street, Glen Iris).The Hoddle Grid is the rectangular grid of the streets in the centre of the city laid out in 1837 by government surveyor Robert Hoddle.All major streets are one and half chains (99 ft or 30 m) in width, while all blocks are exactly 10 chains square (10 acres, 201 m × 201 m).