The facility is located near the line's western terminus at Mount Dennis station, on lands formerly occupied by Kodak's Toronto campus.

The facility was substantially complete in October 2018,[7] and was ready for the delivery of the first Flexity Freedom vehicle on January 8, 2019.

[11] Structures within the MSF will include:[12] The October 2015 design for the facility incorporated two artificial ponds, and green tracks, so its landscaping would better integrate with the adjacent parkland in the Black Creek valley.

The facility will use lithium-ion batteries, which will be charged overnight in order to reduce peak-period power demands and operating costs.

[9] Some local residents and environmental activists were critical of Metrolinx's plan to use a backup generator powered by fossil fuel.

[17][24][18] By October 2018, the Eglinton Maintenance and Storage Facility was substantially complete[7] and on January 8, 2019, received delivery of the first Flexity Freedom vehicle.