The prescriptions of s. 17 are not attracted to the instant case. The conversion as contemplated by s. 17(1) for which permission was required is conversion by the tenant and cannot be a conversion by the landlord. The use of expression "such conversion" in the proviso to s. 17( l) indicates that in case of conversion by the tenant permission is required on the consent of the landlord. Further-more, the term "convert" therein does not denote a mere change in the mode of c occupation but covers only alterations of the physical features. Putting to a different purpose the user of the building is not a conversion of the building as such. The building was used for non-residential purposes and the purpose for which it was sought was for residential purpose. It has been found that the building has rooms which can be D used as bed rooms, sitting rooms etc. and it has a kitchen and dining hall. No alteration or conversion is required if the building is to be used for residential purpose. There was, therefore, no conversion of the building as such involved in the instant case, but a change of user of the building. [86A; 85C·F, 86B l