not altogether unknown to the law of rating. The High Court also observed that in assessing the rent which a hypothetical tenant may pay, several methods are open to the Municipality and if on examining the cases of all the factory buildings within their jurisdiction, the Municipality concluded that the rent which the hypothetical tenant may reasonably be expected to pay for those buildings fits in with the rent which they had fixed by adopting the fiat and uniform rate, the principle of fixing the annual letting value on the basis of the floor area would not be open to challenge. It was assumed in that case that all factory buildings within the area of the Amalner Municipality were alike in essential features and were intended to be used for purposes which were alike, and that probably the Municipality may have been satisfied that the principle enunciated in the rule impugned worked out on the whole as a fair basis for determining the valuation of the building in question. In our view, this approach to a rating problem arising under the Act is not permissible. In any event, there is no • evidence on the record of this case that the factories and "buildings relating thereto" such as ware-houses, godowns and shops of the Mills situate in the com. pound of the mills, may be separately let at the uniform rate prescribed by the Municipality. The vice , of the rule lies in an assumed uniformity of return per square foot which structures of different classes which are in their nature not similar, may reasonably fetch if let out to tenants and in the virtual deprivation to the rate-payer of his statutory right to object to the valuation.