The light rail trains are stored at Mount Dennis Maintenance and Storage Facility in the west end. Unlike legacy streetcar network with 3 (soon to be 4) streetcar yards, there is currently only one place to store them overnight. Currently.
The city is trying to build the Eglinton East LRT from Kennedy Station to Morningside/Sheppard. Will there be a light rail track connection between the Eglinton LRT Line 5 and the Egltinton East LRT, since the two will likely be separate light rail lines? Nothing written down in stone, yet. So, it will be decades before there would be a light rail storage facility in the east end.
Now the bad news. The "preferred" maintenance and storage facility location is near the Toronto Zoo.
View attachment 713387
From
https://www.toronto.ca/services-payments/streets-parking-transportation/transit-in-toronto/transit-expansion/eglinton-east-light-rail-transit/eglinton-east-lrt-project-map/
(Think taking the GO train from Kennedy GO, Eglington GO, or Guildwood GO would be faster to get downtown.)