Nothing in this chapter shall require changes in the drawings, construction, or designated use of a building for which a lawful permit has been issued or otherwise lawfully authorized before the effective date of this chapter, provided that work under the permit or authorization is under active prosecution upon such date, or is actively prosecuted within 90 days after such date, and that all work thereunder is completed, as so authorized, within two years after the date thereof or a duly-authorized extension of time.  However, if the work has been diligently prosecuted, an extension of time shall be granted which shall permit completion of the work in accordance with the original permit.
('91 Code § 150.034)  (Ord. 2203-1966, passed 2-2-67)