AICUSV – I'm not a native Philadelphian, and as I learned more about the city, a Call of Cthulhu game sprang up. From thence, a miniature game formed, in part because I run 7TV but some Yanks don't easily connect to the Brit genre, so a more relatable genre was adopted for American players.
Of course, there is no Columbia Boulevard – there was a Columbia Avenue, renamed to Cecil B. Moore Avenue in recognition of that worthy's contribution to the civil rights movement.
I am assured by my Philly friends that "The Avenue" is still known as "The Avenue", and that the name change discomfited no very many people.
So, in short, it doesn't exist – I like to remove the setting by a step or so. That said, I am working on a street intersection that crosses on a crooked angle, something like Ridge Avenue. That would place the action in the mid-to-low 20's, though my street signs will likely indicate 7th and 7 & 1/2th streets.
Random nostalgic citation: Dale's Discount Grocery Store
Regards,
Keith F.