Abstract: This paper imagines a Transit Oriented Region. It will imagine the region from the micro, the scale of Placemaking, to the macro of overall city structure. This paper attempts to calculate the costs and benefits a proposed expansion of the commuter rail for the Perth Metropolitan Region supplemented by light rail and bus rapid transit in a step by step methodology. The results show the combined proposals enable a doubling to tripling of the Perth public transport system. Urban development opportunities near the stations in the whole system could then absorb the next 30 years of medium density housing and over 50 years of commercial work space without any further greenfield development or entering far into the established residential neighbourhoods. The results demonstrate residential infrastructure costs saved, tonnes of greenhouse gas saved, transportation costs over 50 years and others. External benefits would include health and productivity benefits from living in the new highly walkable centres. The heavy and light rail system costs estimates vary and financing via a ring-fenced value capture fund could significantly defray the costs of the rail system. Will such a plan make Perth a 21st Century global city? How much walking, transit, density, and mixed-use ‘complete community’ does a region require, precinct by precinct, to make any noticeable difference? The results of this paper will make suggestions towards the scale of the operation necessary and the frank discussions required if Australian Cites are to make appreciable changes to their form, mode splits, ecological impact and theirs citizen’s lifestyles.