Is this gramatically correct?

Well the other day, Matt and I were walking home from Nate and Chellie's house and I looked up and noticed this sign:

This is the street that we live on apparently, only shouldn't it be 52nd street? Plus, how do you even pronounce this? I have walked down this street hundreds of times since we lived here and never noticed this before. Chellie, you should tell you neighbor that she should be calling the city on embarrasing incorrect signage rather than spending her time bothering you all That would be classified as a big typo in my book!!