construction, as may be prescribed in this behalf.

Power to regulate future construction of building,- The Chief Officer of a Municipality may subject to the prior approval or the Municipality give public notice of his intention to declare,- a. that in any street or portion thereof specified in such notice, the elevation and construction the frontage of all buildings or any classes of buildings erected or re-erected after such notice shall, in respect of their architectural features be such as the Municipality may consider suitable to the locality; or b. that in any locality sacrificed in such notice, there shall be allowed the erection of only detached or semi-detached building or both and that the land appurtenant to each such building, shall be of an area not less than that specified in such notice; or 415