Respondent N,, 1, as plaintiff, instituted Rent Act Suit No. I 784/6206 of 1963 in the Court of Small Causes at Bombay against Jayantilal Dayalal & Co., respondent No. 2 herein and its three partners, respoindents 3 to 5 who were defendants 1 to 4. The appellants herein were impleaded as defendants 5 to 7. According to the plaintiff, respondents No. 2 to 5 were the owners · oi an open plot of land known as Jalaram Nagar, situate in Greater Bombay and were do\ng business of construction. The said defendants represented to the plaintiff that they were putting up a building in the said property accordin!l to the plans and specificati"ns submitted to the Bombay Mumcipality. The plaintiff. applied to the defendants to let to him, on .the basis of a monthly tqnancy, a portion of the building to be constructed as soon as the building was ready for occupation. Defendants 1 to 4 agreed to do so on the plaintiff advancing a sum of· Rs. 12,500 as Joan towards construction and on his executing a deed of charge, in accordance with the provisions of the Bombay Rf\lltS, Hotel and Lodging House Rates Control Act, 1947 (Bombay Act No. LVII of 1947) (hereinafter called the Act}. The plaintiff agreed to those conditions and accordingly advanced a sum of Rs. 12,500 to defendants 1 to 4 on August 12, 1959 and the said defendants executed a deed of charge in favour of the plaintiff on the said date, which deed of charge was also registered with the Sub Registrar of Bombay on the same day. Defendants 1 to 4 srarted construction of the building in question and though it was completed they failed to Jet out the said premises to the plaintiff in spite of the provisions to that effect in the deed of charge of Au~ust 12, l.959. On the other hand, the said defendants let out the same to some third parties. co1ntrary to and in breach of the provisions contained in the deed of charge. According to s. 18 of the Act. defendants I to 4 were bound and liable 10 complete the construction of the building within a period of 2 years from the date of the agreement and were also bound to Jet out the said premises to the plaintiff within the said period. As dcleindants 1 to 4 had failed to carry out the obligation cast 011. them by the Act, the plaintiff had become entitled to the return of the sum of Rs. 12,500 with interest at 4% per an'.num from August 12, 1959 till the date of ·payment. The deed of charge complies with all the requirements of s. 18 of the Act and under the said Act, the loan for