I was looking at Pacific Dogwood before I posted here. I have never seen it in person but by the pics, I didn't think the leaves matched though the flowers look similar. See the leaf in the first picture in the first post, it is shiny and pointed and looks heavier than the leaf I see in the pics of Pacific Dogwood.
Must admit I was wondering a bit about the leaves when I looked the first time. I was going to say Cornus capitata, an evergreen species from the Himalaya & southern China, as the leaves fit that well, but when I compared pics, the flowerheads didn't match so well (they should be more like Cornus kousa, with strictly 4 bracts, often fairly pointed).
I'm not aware of any C. capitata × C. nuttallii hybrids, but if they exist, that would fit your plant best of all. And no reason why they shouldn't exist, as some other Asia-America dogwood hybrids do exist (e.g. C. florida × C. kousa).
All this time later I finally got an answer thru a neighbor of the owners of this tree. I ran across the pictures again so I emailed their neighbor again to inquire. Resin was right! I was told tonight it is a Cornus capitata aka Himalayan dogwood. He also directed me to a much larger one in the same neighborhood. Another reason to want spring to be here.