My guess is that certain conditions that allowed the NYCC boom to happen in the 80s did not exist during the last downtown office boom.
City of North York's office boom in 70s, 80s, early-90s,... that would be North York Mayor Mel Lastman,... the ultimate salesman!
Office market tanked in early 90s,.... After 1998 amalgamation, nooo-body selling the benefits of North York Centre,....
But North York Centre didn't enjoy later office boom like downtown,... why? In that the original Mel Lastman's new Downtown Plan for the area,... since 1974 Yonge subway extension to Sheppard & Finch Station,.... only Office towers (white buildings in image) to be built along Yonge frontage,... apartment/condos towers (horizontal stripe buildings) only allowed off-Yonge towards Service Ring Roads of Beecroft & Doris,... and this was generally the blue print until mid-1990s,.... j
Just before amalgamation,.... City of North York got a great deal from Menkes new Empress Walk proposal that would place residential condo towers on Yonge st frontage but hidden above podium mall,... deal included rebuilding of larger capacity McKee Public School, rebuilding of larger capacity Earl Haig Secondary School, new Mitchell Field Community Centre,... land conveyance for Doris Road extension,... but now the precedent is set, and residential condos become allowable on Yonge St frontage,.... much more profitable condo towers VS less profitable office towers,.... Menkes likely didn't profit much from Empress Walk,.. but since Menkes was largest developer in North York Centre, they profited from subsequent condo projects on Yonge frontage like their Ultima, GibsonSquare, etc,...
Between 1998 amalgamation and about 2015,... North York Centre Secondary Plan area along Yonge corridor saw about 70 new condo towers built,... but only 1 office tower (5000 Yonge) making this a Vertical Sleeping Community! Since then, while office boom downtown,... there Tridel HullmarkCentre built with 12-storey office at base of North Tower and 3-storey office in podium,... but these were Office-Condo units, sold mainly to oversea investors with little interest in opening office or even renting them out! Ditto for 3rd floor Office-Condo of Bazis Emerald Park. Soon to open is 11-storey regular office tower at G-Goup Ellie Condo,... and Menkes 4800 Yonge under construction now will have about 7-floors of office totalling 15,000m2 of Office Space.