Sorry, there's no basis in fact for declaring that Aura's retail level is any lower than it should be.
The reason that there is a change in level between the concourse level at College Park and the one at Aura is that there's the changing topography to deal with in the area.
Up at College Street, the escalator ride down to PATH level in College Park is just as long as it is from the entrance of Shops at Aura down to PATH level there. At the south end of College Park, however, grade level has dropped enough that it's only a few steps down to PATH level from the street. The stairs leading from College Park PATH level underneath the (future) park to Aura merely reset PATH to deal with that drop.
It has nothing to do with where the loading docks are (which would be another level underground.)
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Dude, like I said, I'm very familiar with the loading docks at College Park which Aura shares,.... the Aura-CollegePark-777Bay loading docks are NOT underneath the basement retail level of Aura; they're on the same level,... here's a floor plan map of the basement retail level of Aura,... notice the clearly labeled loading dock area in dark grey:
http://theshopsataura.ca/floor-plan/
Note: where map reads College St. should really say CollegePark,... then College St.
Notice how small the Aura loading dock is relative to the floorplan,.... in reality, the loading docks gets larger as you go northwest since its part of a network of loading docks for CollagePark & 777 Bay Street - basically all under Barbara Ann Scott Park and the newer part of CollegePark - at the northeast corner of Barbara Ann Scott Park, that cement covered patio area where Richtree set up their summer patio is actually the roof of the loading dock area.
Since for the most part, Aura basically uses the existing ramps and loading docks structures of CollegePark & 777 Bay St,... Aura really didn't need to build much of their own loading dock structures so what would have been the area for their underground loading dock structures were repurposed as their basement retail level,... thus, Aura really did sell loading dock space as their basement retail space!
Note: From Aura basement floorplan map, they placed their food court area (red) as far as possible from main escalator at Yonge Street, so people going to food court are forced to walk through as much of the basement retail level as possible,.... problem is, the food court stalls are like 3/4 empty!,.... so why would people go down there?
Furthermore, it's not really fair comparing retail floor height of Aura with CollegePark which was built almost 100 years ago using very different building structures and thus, their retail floor height tends to be quite large. But, let's go with the comparison anyways,.... using the northeast stairs of CollegePark near Tim Horton & Winners, there's 32 (regular) steps on the staircase between the street level floor and lower concourse floor of CollegePark.
At the northeast corner of Aura retail area, there's no stairs only escalator down to basement. Thus, I'll use that basement Aura retail level to College Park lower concourse level link (the PATH link between Aura and CollegePark),.... where there's 6 + 13 + 10 = 29 (high steps) + another 8 (narrow) steps from CollegePark lower concourse to their streetlevel College Park south entrance,,... for a total of 37 steps (This assumes the south CollegePark street level entrance is level with the Street level entrance of Aura about 100 feet away). This would indicate the basement retail level is at least 20% lower at Aura VS CollegePark,... not really significant like they burried it. NOTE: 29 (high) steps in the PATH link between lower/basement/sub-basement of Aura and lower concourse of CollegePark,.... the only other part of the PATH where there's such a high difference in floor level within the PATH is likely at that stair/escalator between Toronto Dominion Buildings and NorthTower of RoyalBank building (under Wellington).
For comparison sake, at SheppardCentre (built 1976) the staircase between the lower concourse and upper concourse retail floors has 11 + 12 = 23 (high) steps between retail floors.
Ok.... the Aura basement retail level isn't significantly deeper than other underground retail levels that it's would be considered burried,... but it's connection to the lower concourse level of College Park shows how significantly these two levels are apart from each other,... that it requires 29 (high) steps on 3 flights of stairs.
Anyways,... due to all the restrictions of what type of retail can not go into Aura since it can't compete with those in CollegePark,..... and keeping in mind Aura zoning changes were huge and they must have paid an arm and leg in Section 37 community benefit costs to compensate for the height and density changes; where did all that Section 37 go? Some might have gone towards renovation of nearby Barbara Ann Scott Park,... but some probably went for benefits outside of this local area,.... Which is a shame because the basement retail area isn't well suited for retail,.. but probably would have done well as a local child daycare-nursery or local community centre or public library or mini-elementary school or something similar that would have complimented Barbara Ann Scott Park,... all public infrastructures that this part of the city is lacking since it was never originally designed as a high density residential area for which it is now quickly becoming,.... and this would have counted towards Section 37 Community Benefits and actually benefitted the new residents of Aura and the locals as well. Crying shame that the developer and city didn't take this route,.... instead the developer's goal was to maximize their profit by selling useless loading dock space as small Pacific Mall type retail space.
Note: the basement retail level is quite large and as you can see in the above map there's basically 3 parallel north-south route for the PATH through the basement of Aura (probably enough room for 5!),.... obviously, you only need one north-south route (with or without these PacificMall type retail), so the rest of the space could be used as Section 37 community benefits,.... BTW, the PATH connection between Aura and College Park doesn't even have to go through Aura basement retail level!,... directly to the west is Aura's P1 underground parking parking level which also serves as parking for Aura retail area and it's at a higher level than Aura basement retail level (probably 10 feet difference in floor height),... thus, it could have made a better connection with CollegePark lower concourse level since there's less variance between the two floor levels.