In Seligman v. Tucker (1970) 6 Cal.App.3d 691, the plaintiff successfully enforced a restriction against an addition to a house. The restriction, abbreviated by the opinion, read: "'No . . . structure shall be . . . erected . . . upon any lot in such location or in such height as to unreasonably obstruct the view from any other lot . . . .'" (Ibid. at p. 693.)