of this chapter and of any lawf ul regulations pursuant thereto: ( a ) To receive proper declarations of property not previously declared by the owner, or to make official declarations therefor, as the case may require. ( b ) To fix the value of real property not previously assessed and to assess the same for taxation according to law. ( c ) To cancel the declaration of an original owner of property which has changed ownership and to substitute therefor the new declaration in the name of the new owner. ( d ) To cancel, in case more than one declaration of the same property is received, all except the one properly made; but if any declarant shall object to the cancellation of his declaration, such declaration shall not be canceled but shall have the fact no ted thereon and similar notation shall be made on the duplicate declaration. ( e ) To cancel, raise, or lower, as the case may require, the assessment of any parcel or item of real property in any municipality or of the property of any owner or owners therein whenever it appears that the existing assessment, whether originally proper  or not, does not conform to the requirements of law. In the exercise of this power he shall eliminate from the list of taxable property all property which, being exempt, has been improperly included in the same; shall decrease the assessment where property previously assessed has suffered a permanent loss of  value by reason of storm, flood, fire, or other casualty; and shall increase the assessment where taxable improvements have been made upon property subsequent to the last previous assessment. AIcECS [2238-4-7.] Assessment of Tax S ECTION  438 . General Revision of Property Valuations . — When directed by the provincial board the provincial assessor shall effect a general revision of the valuations of the real property in his province or any municipality thereof and shall make a new, o r revised, assessment of the same according to law. No such general revision of assessment shall be made with greater frequency than once in two years. ISDCaT ARTICLE  III Copyright 2012 CD Technologies Asia, Inc. and Accesslaw, Inc. Philippine Law Encyclopedia 2011 139