Most of the building footprints here are inaccurate. Again it's a question of imagery interpretation. Features in imagery; like trees, walls or buildings can obscure others. In situations like these you should try to work out what is the shape of a building (in this case) likely to be. Sometimes different imagery sources can help with this, other times you'll have to give it your best guess.

In this case all of the building footprints should have been squared, given the low resolution imagery you were working with and the architecture of the surrounding buildings. It was more likely that the imagery was distorted or that the building was partially obscured by trees/vegetation than it is for it to have this unique footprint. Buildings tend to take take on this shape near highway intersections of 'odd' angles.

I hope this helps.
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