Any advertising structure or sign which prior to the effective date (12/19/79) of the sign code ordinance (M-2035) codified in this chapter has been lawfully erected, or for which a permit to erect it had been issued prior to the effective date of the sign code ordinance codified in this Chapter and which is rendered nonconforming by this chapter may continue to exist but not to be increased in size. Provided, however, this section shall not apply to signs prohibited under subsection 20.960.030 of this chapter. (Ord. M-3643, 2004)