[slygent]

I only include integer floors in this analysis, but there very few flats with regex \d\w. Or you're surprised there are 4s at all?

[lokopodium]

As seen in Sydney: https://antontsau.livejournal.com/291486.html

[akhatri_aus]

The 4s aren't surprising because of the superstition with 4, it's that you find them that is odd. To best capitalise on the property it would be apt to rename them 3B or 13B. It's a well known practice to avoid the 4 because it wastes value.