Marco Lobo has written in with some interesting memories of this house, which was used as one of the locations in Love is a Many-Splendored Thing:
The house in Deep Water Bay, where so many scenes were filmed was a property called "Arrowhead". It was owned by Portuguese architect Alfredo Alvares. Both my 'Uncle Al' and his wife May have passed away, but I recall them talking about the filming and meeting the stars. It's even possible that the stars were their houseguests for a time. It was a pretty big place.
The main entrance was off Island Rd., which led into the top level as seen from the picture:
From there they used ramps instead of stairs, and sliding doors rather than swinging ones. It was quite a place.
The large flat platform that you can see at the base of the house on the right was a swimming pool, part was open to the sky and part was under the house. As kids we could jump into the pool from the upper verandah, from where I think several scenes in the movie were shot from.
I think (but can't be certain), that the name "Arrowhead" came from Uncle Al's racehorse...or then perhaps he named the horse after the house?
I've set an approximate location on the map based on the description and photo.