I guess it's not surprising that 14-year olds visiting Shibuya wouldn't be conscious of anything but the commercial area around Shibuya-eki, mostly within a 5-minute radius of the station. If they walked another 5 minutes in the right direction, they could easily find themselves in the midst of pure residential areas, a lot closer than Ikejiri-Ohashi, too. My memory is fuzzy, but I think I recall that even the Tokyo Governor's official residence is (or used to be) just a few minutes past the Tokyu/Bunkamura complex.
It's hard to find anywhere in Tokyo zoned for a single kind of use. Chances are if you start walking in one direction anywhere in Tokyo, you'll find retail space, houses, shrines, apartment buildings, factories, and soaplands within a few minutes of each other.