It's hard to say whether the $75/sqft will be enough to encourage more conversions.
For reference, I believe the Barron Building is 11 stories and 100k sqft, and the GoA webpage estimates the project cost at $100M. Is 7.5% of project costs (100k sqft x $75/sqft = $7.5M / $100M = 7.5%) enough of an incentive? I'm not sure, although I'm also not confident in the accuracy of the $100M estimate for the Barron Building conversion, as $1,000/sqft seems high considering Telus Sky cost ~$400M to $450M for ~761k sqft (~$525/sqft to ~600/sqft), although I appreciate that conversion of an office building to a residential building will have unique challenges that a new build of a mixed-use building won't.
I actually think that the $10M cap might be the bigger deterrent to promoting conversions, although the Program webpage does indicate that City Council may approve a greater amount for a particular application.
As an example, Palliser One is 27 stories with typical floor plates of 16,700 sqft. I know that not all floors will be equal, and there is lobby space, but assuming that all 27 stories are 16,700 sqft, that's ~451k sqft. Without a cap, $75/sqft x ~451k sqft = ~$33.8M, which is ~$23.8M over the $10M cap, and only ~$11.2M below the approved budged of $45M for conversions. I don't trust the $1,000/sqft conversion cost from the Barron Building example above to apply to Palliser One.
Do I think that $10M would be enough to convert a building like Palliser One? Maybe, maybe not. Do I think $33.8M would be enough? Yes I do.
The article indicates that the Program "hopes to...help remove nearly half of the 14 million square feet of downtown office space sitting empty" , but the City has only approved $45M for office conversions. 7M sqft x $75/sqft = $525M. That's a $480M shortfall, although it seems like City officials are prepared to go to Council to ask for more money if there is enough demand.
$75/sqft may not be enough, and I think the City will seriously have to consider applications that exceed the $10M cap, but it's clear that the City needs to start somewhere to address the downtown office space vacancy issue (which is in-part, due to the downturn, but also in large part due to Calgary having such a high supply (on a sqft per capita basis)). The incentive program is likely going to be a trial and error, and it seems like the City is willing to take that approach.