What is the effect of a plaintiff's failure to secure and serve a registration certificate for a rental property?

The court determined plaintiff's "undisputed failure to secure and serve the necessary registration certificate constitute[d] a violation of LARSO and provide[d] [d]efendant with an affirmative defense to the unlawful detainer action." Citing Salazar v. Maradeaga (1992) 10 Cal.App.4th Supp. 1, 12 Cal.Rptr.2d 676, the court concluded plaintiff could not bring an action premised on a three-day notice to perform covenants or quit because the underlying lease that formed the basis of his action was void. Judgment in defendant's favor was entered that same day.