Northern Light
Superstar
We had a built in AC unit in our apartment here that looked like it was from the 50s and never worked. They removed it when they rebuilt our balcony (before they told us we were getting evicted) but left a hole in the wall where it was.
So it may well have been original.
You can see that new vents have been placed in several rows along the building; I'm assuming these are for a/c.
Though there are other amenities you could install that would require it (dryers).
It's rare, but I have seen a multi-res landlord retrofit ensuite laundry.