Does the Notice of Completion have to be initiated within 30 days of the WHOLE project completion or just OUR PORTION?

This may be helpful regarding notices of completion: https://www.levelset.com/blog/should-you-monitor-for-a-california-notice-of-completion/#:~:text=What%20Is%20a%20California%20Notice,the%20construction%20project%20in%20stone.