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How can I set the block to block-2 at the specified coordinates(red point)?
Assuming that I already know the coordinate of the yellow point, what should I do?

Code (Skript):

1. on leftclick on a grass:
2.     player is holding {city_center}
3.     set {lx.citycenter} to the event-block's x-coordinate
4.     set {ly.citycenter} to the event-block's y-coordinate
5.     set {lz.citycenter} to the event-block's z-coordinate
6.     set the block to air