Suburbia

Tiles must always be placed so that at least one straight edge is adjacent to another tile (face up or face down). (page 3)

Resolve in this order: pay the tile cost (and any Market cost), apply the immediate effect, apply the tile’s conditional effect, apply conditional effects of adjacent tiles, apply non-adjacent effects, check other players’ tiles that affect you, then check whether your tile impacts other boroughs. (page 3)

When taking a tile to use as a lake you pay only the Market cost (not the printed tile cost), place it face-down adjacent to your tiles, and immediately receive $2 per adjacent residential/industrial/commercial tile; placing a lake next to another lake does not grant the $2 adjacency. (page 2)

An Investment Marker doubles only the effects of the tile it’s placed on for the rest of the game and does not retrigger other tiles’ conditional effects when placed; however, future tiles placed adjacent to the invested tile will benefit from the doubled effect. (page 2)

You immediately decrease your Income and Reputation by one space for each Red Line you cross during population adjustment (apply this as soon as you cross it), but Red Lines are ignored during final scoring—endgame population gains do not trigger Red Line penalties. (pages 2 and 3)