New retail for Yonge and Sheppard.
The site is owned by the TTC and to be leased. The city requires a commercial office tower on site, however there is no demand and so they are planning to lease the site for about 20 years to a temporary business. They found that setting out a lease for 10 or 15 years would earn them a poor rate of return as even a best buy or tim hortons wants some minimum time commitments before it builds it's temporary box/parking lot.
I'd prefer housing with retail base as there is no guarantee that the market will be prime for office construction in 20 years when the lease expires either. This means that the intersection of the 2 subway lines will be a density vaccum for decades to come.