Here's an interesting find: The Tudor mansion seen in "Highest Castle, Deepest Grave" (Season 4) and "The Diamond That Nobody Stole" (Season 5) actually exists at the address given for it in "The Diamond That Nobody Stole." The address is 2861 Manoa Road.
To see it, go to Google maps, key in the address, go to the photographs. Turn to the opposite side of the street, and you will see the stone wall. Pan forward to the driveway, then pan left to see one end of the house behind the landscaping. You will recognize the post-and-beam construction seen as McGarrett turns into the driveway in both episodes.