For the past few months, we have referred to the two houses as "this house" and "the house across the street." Problem is, those two names are entirely based on where you are at the time.
I have ruminated over appropriate names for the two houses, when the best names were actually a part of our home history all along.
Our main house, the one where we've lived for 16 years, will henceforth be known as Lansdowne (since it is indeed located in a down--and Lansdowne was the name of the neighborhood in which we lived from 1986 until 1996), while the newer house is hitherto named Marchmont (since it is indeed on a hill overlooking Lansdowne--and Marchmont was the name of the beloved home in which I lived from 1962 until 1971, and in which Mom and Dad lived from 1962 until the time they left us, in 2002 and 2007 respectively).
The Naming of Houses is now done.