The idea was developed by legal scholars like Christian Iaione (Italy) around 2007/2008. Published in two books on the so called in-house companies managing large local utilities networks and the regulation of urban mobility.
describe key features here
According to Iaione
the public-commons approach proved to work in a terrific way on small scale resources ... as the Bologna regulation shows.
Since 2015, via processus like Co-Bologna html 
, Co-Roma html or Co-City Turin html or html , different approaches for larger scale resources are being designed and tested.
# Sources
Christian Iaione and Sheila Foster: The Co-City", American Journal of Economics and Sociology ; City as a commons.
# See also Commons Public Partnership