Number 4 in Arcadia

A Taiwanese friend of mine had his warehouse address changed for his unit #, it used to have a 4 in it.

Superstition prompts Arcadia City Council to weigh taking address change requests again - SG Tribune

Arcadia, California due to its good school system has a large Chinese population.

For Chinese the rankings for schools in LA County basically are:

San Marino
Arcadia
Walnut/Diamond Bar
Rowland High School/ Wilson (Hacienda Heights)

And this is reflected in the housing prices...

The number 4 in Mandarin Chinese and Japanese has the same sound as death.  Which is why in Japan you can get a discount on an apartment with the number 4 in it :-)

Reference - 4's Chinese Unlucky Symbol