The plaintiffs are landlords of three blocks of apartments situate at Ardmore Park, and the defendants, during the period October 15, 1979 to February 29, 1984 were the tenants of the plaintiffs of one of the apartments, namely: Unit 02–09 situate on the second floor of the block of apartments known as the "Langkawi". In respect of this apartment, three successive tenancy agreements had been entered into between the plaintiffs and the defendants covering the period. The first tenancy agreement dated November 5, 1979 created a term of 24 months commencing from October 15, 1979, and on the expiry thereof, the second tenancy agreement dated October 21, 1981 was made for a similar term of 24 months commencing from October 15, 1981. Immediately prior to the expiry of the second tenancy agreement, the parties negotiated for a renewal of the term for a further period of 12 months commencing October 15, 1983, and accordingly, the third tenancy agreement dated December 31, 1983 expressed to cover this period was made between them. The three tenancy agreements contained substantially the same terms and conditions, save and except that the rent paid under the first tenancy agreement w