To open up the console, hit the CTRL, SHIFT, and C keys all at once. Then type in the following cheats.

Code - Effect

motherlode - $50,000
IndividualRoofSlopeAngle [15/75] - Activates a tool to change the roof slopes of individual roofs on a lot
boolprop ShowCatalogePFlags [true/false] - Activates labels in the detail view of each Buy mode and Build mode objects to show which product they came from (EP or SP)
DeleteAllObjects [Doors/Windows/Stairs] - Deletes all Doors, Windows or Stairs on lot
DeleteAllFences - Deletes all fences on lot
DeleteAllHalfWalls - Deletes all half walls on lot
DeleteAllWalls - Deletes all walls on lot
boolprop ControlPets [on/off] - Makes pets fully controlable, but you can't cancel actions from their queue
boolprop PetActionCancel [true/false] - Makes the actions in a pet's queue accessible
boolprop DisablePuppyKittenAging [true/false] - Turns off aging for kittens and puppies
boolprop PetsFreeWill [true/false] - Turns pet free will off