New cities Flagstone and Yarrabilba will rival Cairns' population, but is infrastructure keeping up?

Yarrabilba's sprawling suburban growth is extending each month. (ABC Radio Brisbane: Lucy Stone)

As Queensland grapples with the ongoing housing crisis, two burgeoning cities an hour south of Brisbane continue to steadily grow.  

A decade ago, the Anna Bligh state government declared two "priority development areas", or PDAs, south of Logan City, at Flagstone and Yarrabilba, earmarking them as the future home of 190,000 people within 40 years.