I think that this is a job that should be delegated to the Toronto Parking Authority.These would be reserved for residents and MAYBE their visitors. Creating a public garage within a condo or other residential building is going to be difficult. Who will run the parking? will it open 24/7? Who will repair it? Can it be large enough to be economic?
Every new condo should be built with equivalent number of parking spots on the the closest main street for a block up to 10% of all spaces, and then street parking eliminated.
The TPA would then take over running the garage as a Green P. This could be as simple as installing ticket metres that are checked by parking enforcement who already check street parking or something more involved like assembling an enclosed area with an automated gate and a payment kiosk. The condo board would get a nice cut after maintenance expenses, the city would still get some parking revenue and Toronto streets would cease being used to store cars and instead used to move people.