It is hereby declared to be the legislative intent that, if any provision or provisions of this chapter or the application thereof to any building or other structure or tract of land is declared by a court of competent jurisdiction to be invalid or ineffective in whole or in part, or to be inapplicable to any person or situation, the effect of such decision shall be limited to the provision or provisions which are expressly stated in the decision to be invalid or ineffective or the zoning lot, building or other structure or tract of land immediately involved in the controversy. All other provisions of this chapter shall continue to be separately and fully effective, and the application of any such provision to other persons or situations shall not be affected.