Section 4 of The Landlord and Tenant (Shops, Hotels and Catering Establishments) Act CAP 301: Termination of and alteration of terms and conditions in controlled tenancy

(1) Notwithstanding the provisions of any other written law or anything contained in the terms and conditions of a controlled tenancy, no such tenancy shall terminate or be terminated, and no term or condition in, or right or service enjoyed by the tenant of, any such tenancy shall be altered, otherwise than in accordance with the following provisions of this Act.
(2) A landlord who wishes to terminate a controlled tenancy, or to alter, to the detriment of the tenant, any term or condition in, or right or service enjoyed by the tenant under, such a tenancy, shall give notice in that behalf to the tenant in the prescribed form.
(3) A tenant who wishes to obtain a reassessment of the rent of a controlled tenancy or the alteration of any term or condition in, or of any right or service enjoyed by him under, such a tenancy, shall give notice in that behalf to the landlord in the prescribed form.
(4) No tenancy notice shall take effect until such date, not being less than two months after the receipt thereof by the receiving party, as shall be specified therein:
Provided that—
(i) where notice is given of the termination of a controlled tenancy, the date of termination shall not be earlier than the earliest date on which, but for the provisions of this Act, the tenancy would have, or could have been, terminated;
(ii) where the terms and conditions of a controlled tenancy provide for a period of notice exceeding two months, that period shall be substituted for the said period of two months after the receipt of the tenancy notice;
(iii) the parties to the tenancy may agree in writing to any lesser period of notice.
(5) A tenancy notice shall not be effective for any of the purposes of this Act unless it specifies the grounds upon which the requesting party seeks the termination, alteration or reassessment concerned and requires the receiving party to notify the requesting party in writing, within one month after the date of receipt of the notice, whether or not he agrees to comply with the notice.
(6) A tenancy notice may be given to the receiving party by delivering it to him personally, or to an adult member of his family, or to any other servant residing within or employed in the premises concerned, or to his employer, or by sending it by prepaid registered post to his last known address, and any such notice shall be deemed to have been given on the date on which it was so delivered, or on the date of the postal receipt given by a person receiving the letter from the postal authorities, as the case may be.