Sydney is about to become the second Tokyo, with at least 23 districts with population density almost as high as CBD, areas that are clearly under great pressure, including Hurstville,Canterbury,Auburn,Rockdale,Chatswood and Dee Why.
Areas such as Ryde,Strathfield,Liverpool,Penrith and Parramatta are under similar pressure, according to AdelaideNow.
High density means that the distinction between CBD and suburban life has become increasingly blurred, with local residents having to cope with more congestion, grabbing green spaces, educational resources, transportation and infrastructure.
The situation will only get worse, experts warn, as Sydney's migrants drive population growth and increase demand for housing.
Eventually, traditional suburban lifestyles, such as backyard swimming pools, will eventually disappear. NSW professor Bill Randolph says economic growth and increased density will fundamentally change the suburban structure.
"No one will watch you build a 20-story tower in downtown Sydney, but it's different in Liverpool," he said.
The pace of change is alarming, with nearly six hundred and twenty seven thousand nine hundred and ninety nine new homes built in Sydney since 1991, accounting for 2 / 3 of the entire Brisbane
Urban density in Greater Sydney increased by 25% between 2005 and 2017, according to ABS.
Last year, CBD had a city density of 7212 people per square kilometre, 18 districts had a higher population density than CBD, and 23 districts had a population density of just 2000 people per square kilometre.
The higher population density included Potts Point-Woolloomooloo (16229.9), Bondi Beach-North Bondi (9453.8), Lakemba (8297.8) and Petersham-Stanmore (7221.7).
Others close to Ashfield (7119.5), Campsie (6883), Dulwich Hill-Lewisham (6619), Dee Why-North Curl (6566.8), Hurstville (7062.7) and Double Bay-Bellevue Hill (5692.8).
The biggest pressure came from a 145% increase in population density in Homebush-Silverwater, followed by Waterloo-Beaconsfield,Concord West- North Strathfield,Homebush and Arncliffe,Bardwell Valley..
Just as Japan created a high-density suburban satellite city, Sydney's Parramatta,Liverpool,Chatswood,Burwood and Hornsby also became the satellite areas of CBD.
Sydney's population reached 5.1 million in June 2017, and while most of the growing population has been pastoral, population density has more than doubled in some areas within a kilometre of CBD15.
Professor Randolph believes this development has revolutionized Sydney.