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Each street is numbered independently in ascending order, but you may skip empty houses and fill them later, and you may skip number values. You cannot use the same number twice in one street except through the Extension action (p. 7).

You must use one of the available numbers if you can; if none fits, cross out the next Permit Refusal box instead. You then do not number a house or take an action (p. 7).

No, actions are optional. You can take the chosen action only if you also use its number; you cannot take an action when you receive a Permit Refusal (p. 7).

No. The pool action lets you circle a pool only when you number a house that has one; if you number that house using a different action, you can never build its pool later (p. 9).

An estate is complete when every house between its fences is numbered. Complete estates of up to 6 houses score; an estate of 7 or more houses scores nothing (p. 8).

Yes, if you validate it in the same round, you still score the highest value. In a later round, you score the lowest value; each player can validate each plan only once (p. 10).