Check out the former NET building in the opening from #1197:

Then take a look at it during the closing from #1197:

Weird, huh? Same episode.
I vaguely remember this house as the red "one window" version ... but I don't believe it was around long.
That "NET building" was one that went through a lot of changes over the years as well. Started as NET building from reverse angle, then color NET building, then brown building, then red building with one window, then red building with more windows.
Paul, you posted this from #1703:

Notice that the slanted roof on the red building has a thicker border around it -- and there are numerous windowsills. The border on the roof first showed up in #1631 (Growing, 1991)
Here's an earlier version that doesn't have the border:

You'll notice that the little white thing (skylight, I believe) on the roof isn't in the earlier version, either. That didn't come about until episode #1491 (Play, 1982)