The seller dates this streetcar slide as early 1950s.

eBay
I was keen to see if the Safeway and Reynolds Pharmacy buildings were still around - luckily there are signs for Avenue 50 visible on both sides of the street, so that narrowed down my search. It's actually the intersection of Avenue 50 and York Boulevard, and both buildings are still standing, albeit with a few modifications. What a shame that the pharmacy has lost the top of its detailing. At least the palm trees are doing well.

GSV
Here's a closer look at the old Safeway building. Even though this side is hidden in the original slide, I'm quite sure it didn't have this ugly box on the front. A quick Google says that the building is now the MorYork Gallery, although their
blogspot and
Facebook page don't seem to have been updated since last June. I'm guessing that the building to the left, now the Pyong Kang Church, dates back to before the slide was taken.

GSV