Excellent! Thanks for the inputs @Vonter! Will go ahead as suggested.

Thanks, Vonter! I do have some follow-up questions:

1. Moving the outline to align with the base - does this also imply for non-highrise buildings? Some of the smaller buildings usually closely connected have no real way to identify their base from what I can see.

2. When a road is "covered" by the building (from the satellite image's perspective) would that have such a tag?

Thanks a lot!