Sounds like there was even something happening for BC Tel at Bentall at one time as well:
B.C. Telephone, Bentall Centre - proposed
July 3, 1970 (Creation)
https://searcharchives.vancouver.ca/...entre-proposed
Here's some definitive Vanouver city council meetings on the negotiations for the BC Tel building in 1972.
Quote:
The Special Committee has met on three occasions with
a representative of Fairview Corporation and has carried on correspondence with Fairview Corporation relative to a fair basis upon
which City Council would approve the action of Fairview Corporation
to sell to B.C. Telephone Company, air space to provide the site
for a 37 storey tower. The foregoing would be achieved by creating
an air space parcel on parcels under the "Air Space Titles Act of
British Columbia".
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https://searcharchives.vancouver.ca/...es-dec-29-1972
This is also part of the city wanting lighter colours for the glass after people complained about the TD and IBM towers.
Another Sun article from March 22, 1973
B.C. Tel quits Block 42 on issue of design change
https://www.newspapers.com/newspage/493215302/
Wisdom from Alderman Rankin:
"If B.C. Telephone Company docs not build in Block 42, it will certainly build elsewhere
in the city and we will certainly receive taxes from that development."
https://searcharchives.vancouver.ca/...12-29_SPEC.pdf
That makes even more sense why they built directly on the boundary of Vancouver.
Short summary: City lost some parking money revenue because Eatons moved late into Pacific Centre (didn't want to move during Christmas season), City wanted Fairview to front some money on those losses and design changes for air rights. Telus would only build if they could own the building but that required the air rights that Fairview didn't own.