Any lots in a final plat filed for record shall be a valid land use notwithstanding any change in zoning laws for a period of seven years from the date of filing. A subdivision shall be governed by the terms of approval of the final plat and the statutes, ordinances, and regulations in effect at the time of approval under Chapter 16.15 SMC unless the city council finds that a change in conditions creates a serious threat to the public health or safety in the subdivision; provided, that this provision shall expire December 31, 2014, consistent with RCW 58.17.140 as amended by the 2010 State Legislature in SSB 6544, on which date the effective period for the final plat shall be five years. (Ord. 1266 § 4, 2010).