Upon referral as provided in Section 17.54.050, the planning commission shall consider the district classification of a use not listed in any part of this title, and shall make such investigations as are necessary to compare the nature and characteristics of the use in question with those of the listed uses in the various districts. If the use is found to be, in all essentials pertinent to the intent of this title of the same character as a permitted use in any district or districts, or of the same character as a conditional use in any district or districts, the commission shall so determine and the order shall be final, unless a notice of appeal is filed pursuant to Section 17.54.670 within ten days after the date of such an order. The person requesting the determination shall be notified forthwith and the final determination shall become a permanent public record. (Prior gen. code § 8-91.1)