I think it's worthwhile to read the Planning Rationale report from the application:
http://webcast.ottawa.ca/plan/All_Im...02-08-0106.PDF
The big box store is at the back of the lot so that the building shields the backyards of the houses to the north from the noise and lighting of the parking lot.
It also specifically states that the buildings along Baseline and Clyde will have entrances from both the street and the parking lot:
From page 15 of the PDF:
"It is intended that the street side and interior side of these buildings will have full architectural treatment and full accesses."
Frankly I think this is the best bix-box type development this city has yet seen.