The petitioner constructed a building having a plinth area of 1007.73 sq. meters in Ettumanoor Panchayath. It is the case of the petitioner that the construction of the building was completed on 20.5.2002, and by Ext.P1 order of assessment under the Kerala Building Tax Act, 1975, the petitioner was subjected to the levy of building tax, at the rate applicable to buildings constructed within Special Grade Grama Panchayats. Although the petitioner has paid the entire amount assessed under Ext.P1 order of assessment, the challenge in the writ petition is essentially against the provisions of the Schedule to the Kerala Building Tax Act, inasmuch as it brings about a classification between Grama Panchayats, Special Grade Grama Panchayat/Town Panchayats/Municipal Council, and Municipal Corporations for the purposes of levy of building tax. It is also the case of the petitioner that the classification of the Grama Panchayats as Grama Panchayats and Special Grade Grama Panchayts is based on a similar classification that was effected through Ext.P3 Circular, purported to have been issued under the Kerala Panchayats Act, 1960, and which, according to the petitioner, has not been published