Thanks for working on this!

For this kind of change I think it’s important to document which imagery you used as a reference since the various options aren’t all in agreement. You can do this with the source and/or imagery_used tags on the changeset.

Much of Seattle’s building alignment issues appear to have originated with the 2013 import and it would be nice to come to a broader consensus on what to do about it.

In this case it looks like you aligned to the current Bing aerial imagery. If you haven’t yet, do also consider King County orthoimagery which seems to be of high quality but differs in alignment from Bing. I’ve been meaning to do a more thorough comparison but haven’t personally gotten to it yet.