The place you’re looking for is called Kamar-Taj.
In his quest to heal his injured hands, Stephen Strange seeks out Jonathan Pangborn, a spinal injury patient that has somehow regained the ability to walk.
This difficult-to-find basketball court appears to be at the Westway Sports & Fitness Centre in London, located under the A-40 highway. Thanks to a user on Reddit for posting images of this location to aide in tracking it down.
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(Doctor Strange, 2016)



