My sister's house is on a street that wraps around a steep hill. There is no "other side of the street" because that would have people going downhill into their driveways. Instead you see the backs of the houses on the next street down.
I believe that all the houses have even numbers, but they don't run sequentially. The first house is #2, the second house is #8, the third is #14, and so on. They're narrow lots, too, so it's not as if they were double lots that used up two numbers, just in case they got split later. Sister's house, by the usual numbering system, should be #24. Instead it's #52.