Interesting point about landlords.
In Bronxville village, a bank of shops went out of business in the 2008-2009 crisis and bubble burst. They've sat vacant ever since. I don't think there are any other vacant storefronts in the village. Certainly not like what JPod describes on the UWS.
But nothing ever opened in any of them. (I think there are four.) I later overhead some men talking about it. Apparently, the spaces are all owned by the same landlord and he was asking a massive rent that nobody was willing to pay. He preferred to just wait until he could get someone to bite and apparently could afford to do so. The village government was annoyed because they wanted those properties to be used (of course the man still had to pay the taxes, but he could afford to do that and wait).
It appears that at least one of them will finally get a new business, seven years later.
Sounds kind of like the dynamic he describes.