interesting. your city is starting to look like hong kong, very tall, and with very little room to work with. one of the defining features of hong kong is that it has an efficient and very well-placed subterranian mass-tranit system, but i dont see much indication of that in your city, save one mentioned people mover between the regional transit center and old calgary. most of your transit is surface based in the form of trams and elevated highways. try going a bit more underground. take boston for example: the turnpike was built under half of downtown, and the central artery tunnel replaced an elevated highway along the east-side, allowing more room for development and also increasing land-value. i would suggest initiating a development plan to convert your over-ground expressway running through new calgary into an under-ground/sunken turnpike using classical tunneling techniques, and providing only a select number of high-capacity onramps, such as a T-onramp onto that avenue leading from the roundabout. forcing down-town commuters onto a wimpy two-lane road before making their way to their jobs is just bad city-planning (no offence intended) and the added space would give your downtown breathing room for, perhaps, some hill-top condos and an office complex. also, you do not have many avenues, so surely traffic congestion must be a serious issue for you. i would suggest connecting all of your immediate medium-level residential neighborhoods, such as the coastal devlopment you are planning, to your downtown area via a couple of well-planned subway routes. although subway may require a steep capital investment, it is more flexible than elevated rail, and has a higher capacity and is faster than trams, plus it does not interfere with surface traffic at all. and if you plan it well, along routes of heavy usage, the system will pay for itself in a couple of decades in fares. i have built cities where the mass transit system makes money, and you can too so long as you do not become too reliant on cars as the dominant means of tranportation.
as for the high-speed rail-line, i suggest that instead of bringing the station to development, bring development to the station. mass-transit has a funny way of increasing the demand for surrounding real-estate, so it would be best if you leave the station where it is, and surround it in a small corporate village, with a medium residential project running along the shoreline on either side, just on the other side of the hill from your own planned redsidential development. the subway route you mentioned could then be developed into a broader regional transit system, connecting old calgary, through the new development, and eventualy into new calgary, using the hsr station as the main junction, and providing a good coastline local route for commuters that would not have to pass through any industry.
one more thing: the high-speed rail line should only be extended if you plan on running it out of the city. hsr should not be used as a inner-city commuter rail service, but rather as an intercity connector, with perhaps one or two stations per city acting as express hubs on a larger and broader local system. thus, it would be best if you eliminate the small station just on the other side of the hill from your regional transit center, and instead connect the rtc to downtown via a litany of local means (subway, trams, buses), seeing as to how you already have a commuter rail station in the same position as the small hsr station. hsr stations should be at the very least a half-mile apart, in order to allow the train to gain speed and truely be high-speed rail.
if you look up "diagonal subway" on the stex, you will come across a set of transit-enabled road-top subway-entrances/bus-stops that can be put almost anywhere, and wont take up valuable development space. i cant remember at the moment who made them, but i have used them extensively in my cities with pleasing results.
and here is a last little word of wisdom: "redundancy is key" direct routes are most efficient, and availability reduces congestion.
