11. (1) The office building property class applies within a single-tier or upper-tier municipality only if the council of the municipality has passed a by-law opting to have the office building property class apply within the municipality.  O. Reg. 282/98, s. 11 (1); O. Reg. 198/04, s. 5 (1); O. Reg. 384/18, s. 1 (1). (2) The office building property class consists of the rentable area of an office building that would otherwise be in the commercial property class that exceeds 25,000 square feet.  O. Reg. 282/98, s. 11 (2). (3) For the purposes of subsection (2), “office building” means, (a)  a building that is used primarily for offices, (b)  the part of a building that, but for this section, would otherwise be classified in the commercial property class if that part of the building is used primarily for offices.  O. Reg. 282/98, s. 11 (3). (4) If all of the land the office building is part of is in the commercial property class and the office building property class, the share of the assessed value that is attributable to the land described in subsection (2) shall be determined in accordance with the following: Share of assessed value = Assessed value of land × [(Rentable area – 25,000)/Rentable area] where, “Share of assessed value” means the assessed value of the land in the office building property class; “Assessed value of land” means the assessed value of the land; “Rentable area” means the rentable area, measured in square feet, of the office building and other structures on the land. O. Reg. 282/98, s. 11 (4). (5) If part of the land the office building is part of is in a class of real property other than the commercial property class or the office building property class, the share of the assessed value that is attributable to the land described in subsection (2) shall be determined in accordance with the following: Share of assessed value = Assessed value of land × [(Rentable area – 25,000)/Rentable area] where, “Share of assessed value” means the assessed value of the land in the office building property class; “Assessed value of land” means the assessed value attributable to the part of the land that is in the commercial property class or that, but for this section, would otherwise be in the commercial property class; “Rentable area” means the rentable area, measured in square feet, of the parts of the office building and other structures on the land that are in the commercial property class or that, but for this section, would otherwise be in the commercial property class. O. Reg. 282/98, s. 11 (5). (6) For the purposes of this section, the following shall be deemed not to be in the commercial property class: 1.  A hotel as defined in the Hotel Registration of Guests Act. 2.  A shopping centre within the meaning of subsection 12 (3).  O. Reg. 282/98, s. 11 (6). (7) For the purposes of this section, rentable area shall be determined in accordance with the Standard Method for Measuring Floor Area in Office Buildings, ANSI/BOMA Z65.1-1996, approved by the American National Standards Institute, Inc. on June 7, 1996 and published by the Building Owners and Managers Association International.  O. Reg. 282/98, s. 11 (7). (8) Revoked: O. Reg. 384/18, s. 1 (2). (9) Revoked: O. Reg. 575/06, s. 3. Shopping Centre Property Class