Typically 1 or 2 full calendar months’ notice, most agencies are 2 calendar months. I.E. if your lease is up May 31st, and you do not wish to renew your lease and there is a two calendar month notice period, you need to inform your landlord on or before March 31st. If you give your notice after that date, the landlord can hold you to an additional month if he/she so chooses, meaning you would need to pay rent through June instead of paying through May.