Any conditional use permit granted pursuant to chapter 11-4 shall be considered a lawful use. No conditional use will be prohibited due to changes on neighboring land which occurred after the application for the conditional use is received. No conditional use shall be made nonconforming due to changes on neighboring land which occurred after the application for the conditional use is granted pursuant to chapter 11-4 unless the conditional use is not pursued by the applicant for a period of more than one year.
SDCL 11-4-4.6