text: Good catch. It looks like the geocoding service that OpenStreetMap.org uses doesn't realize that the area exists. When the service looks for a place with a house number of "137" that belongs to "north el camino real" in Encinitas, it comes up empty.
  
  I'll see if there's a more appropriate way to tag the area. Perhaps that one will be more acceptable to Nominatim. If I can't think of a better way to tag it, then I'm afraid this point of interest will remain hard to find due to the "Tagging for the renderer" policy (https://wiki.openstreetmap.org/wiki/Tagging_for_the_renderer).