The city can't force office development. There is cheap land and surface parking outside the core and that is where most office development is taking place. The City can offer some reduce cost to spur office development, but not going to do much when it been 30 years since the last office tower was built.
There is are a few 14 story office tower to be built at the north side of Sq One and a 30s for the Exchange place. There are 4 floors of office space in Parkside Village building that is mostly empty after 5 years being open.
Not everyone is an office worker and COVID-19 will see less working in an office tower now.
Rathburn is torn up and having a major impact on CCTT that the terminal will be close shortly with moving bus stops locations on Rathburn for the rest of the year.
As a note, TTC has refused to use the lands at Islington and Yonge/Sheppard for decade as they wanted office towers on them, but no one willing to have one built. CreatTO is now going to build affordable housing on them. The east lot at Kipling to to see residential development. Wilson Subway lot is to see 5 towers of affordable housing under phase 1 now,