If its just to bring people to replace the local hospital crowd, just build a humongous under ground car park!
It will bring people to the East End day in day out, link it to the trams and it can feed the city with people. And most importantly pay for it's self unlike a lot of other flakey ideas.
Knock down just about all the old hospital buildings
Convert the couple of Heritage buildings into an extended hours school catering for high, primary and adult students and add a massive child care centre for city working/shopping mum and dads.
Build a mega multiple level underground car park under the rest of the site with access from and under Frome and from and under North Tce
Cover the whole thing with gardens and lawns and an amphitheatre for the school and events.
Bring the tram down North Tce to the site and loop back up Frome Rd and back down Pirie/Waymouth
Remove all parking on Frome road north of North Tce to the river, basically only making it access to the university, new schools and car park plus give road space for a proper segregated bike lane linking the linear park bike way to the city.
Close Frome (and it's extension Regent) South of North Tce to all traffic and have it an exclusive tram, pedestrian and bike road and possibly do the the same with Pirie /Waymouth streets.
(Basically Pirie, Waymouth and Frome are the cities narrowest roads anyway and ideal for trams, people and bikes when traffic and parking are removed).
This would give the city dedicated segregated north/South, East/west bike and pedestrian routes through the CBD and keep most bikes and walkers to work off of a lot of the other roads.
This may further promote some more interesting cafés and breakfast bars and shops and high rise residential options on these streets.
The tram would link to the new mega car park/schools/child care which in turn would keep thousands of cars out of the CBD, but bring thousands of people daily to the east end to replace those lost when the hospital closes and keep the east end restaurants and shops viable.
The other advantage is parking for Adelaide oval, Fringe and Womad events.
To complete the picture I would as mentioned by others on this site close Rundle street through the east parklands to traffic and return it to park lands and replace it with a new parklands road linking Rundle Street kent town to the much wider Grenfell street.
All the removed soil for the mega car park would be ideal to box in and cover the rail lines between the Torrens and the new hospital and beyond, but thats another protect.
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