Monster
This variant requires that a player supply an extra little plastic piece to represent a monster that is destroying Manhattan. Place this piece in the lower left corner of Soho when the game begins. Whenever a player plays a card, move the monster one square in the direction indicated on the card. If there is a building in that block, it is destroyed and those pieces are removed from the game. If the monster tries to leave a neighborhood, move him to the adjacent neighborhood (as if all 6 were lined up in a 3x2 rectangle). Squares with a monster on them cannot be built on.