I don't think that there is any real value in having the Crosstown proceed underground on Eglinton proper east of Laird toward Brentcliffe. The following is an alternative that is definitely more expensive but is, perhaps, also more useful.
From the corner of Eglinton and Laird, tunnel diagonally to Vanderhoof and Brentcliffe and establish a station, with a surface bus platform, there. The bus platform, roughly at the southeast corner of the intersection would be a terminus for the 51 Leslie and 56 Leaside routes, with the 88 / 88A South Leaside running through the station.
This station would benefit:
- The residents of "Hyde Park" and of Scenic towers 1, 2, and 3 directly;
- The residents of North Leaside at Eglinton and Brentcliffe (reasonable walking distance compared with existing two bus stops);
- The residents of Thorncliffe Park, via the 88 / 88A South Leaside route;
- Out of area shoppers that could more easily access the area's big box stores.
The line would continue underground east along Vanderhoof to the edge of the Don Valley, likely impacting the existence of one warehouse, before emerging on a bridge that would roughly parallel the east side of the CP Rail bridge. This bridge would cross over Eglinton to provide a potential link to a future GO Transit line, and service to the existing condo community, before turning east and gradually descending and going underground to reach Eglinton and Don Mills.