Pieris japonica or Lily of the Valley Bush.
I noticed this plant as I parked at a job this morning. These are extremely slow growing shrubs that prefer a sheltered position and plenty of summer watering. Pieris flower in late winter and early spring in pink, or white in this case. I just love how the flowers appear in clusters and hang delicately from the plant. This is another of one of those plants that fade into the background for most of the year before leaping into view when in flower.