All buildings in completed rows score positive points, while all buildings in incomplete rows score negative points. It is possible to have zero completed rows of buildings.
A building scores points only for the player who holds the Company Certificate matching the color of the topmost Floor cube. Each Floor cube in that building scores points equal to their printed value to the player who owns it. The value of the Rooftop is also added.
This building scores 9 points for the owner of blue.
If this building were in an incomplete row, the owner of Blue would lose 9 points.
If this building were in a row with the Mayor, the score of the building would be doubled.