Also, including amounts in the 3-day notice that are not yet due, such as unbilled common area maintenance expenses (CAMs), is not a reasonable estimate of delinquent amounts. [WDT- Winchester v. Nilsson (1994) 27 CA4th 516] An estimate of rent owed in a 3-day notice is considered reasonable if: the actual amount owed is truly in question; and the delinquent amount demanded is neither 20% more or