Submission schedule for multiple buildings

If the buildings have separate registrations, then you submit each building for certification at different times.

Yes. If each building is registered as a separate LEED project and you are using the Campus Credit (aka Master Site, or Part 1) approach, it is acceptable to submit the individual building projects at different times. However, please note that the Master Site project must be submitted before (or at the same time) as the first of the individual bldg projects that wish to utilize campus credits achieved in the Master Site project.

What about if the first building goes in for certification years before the other building construction is completed and submit for certification? Is there a time requirement that the master site projects need to be within? thanks!

There is a maximum limit that is determined by the Sunset date for the rating system under which the Master Site has been reviewed. If the subsequent project(s) cannot be completed and submitted for review prior to that sunset date, it would do no good to include them in the Master Site project. Please refer to section 12 of the GBCI LEED Certification Policy Manual (https://www.leedonline.com/irj/go/km/docs/documents/usgbc/leed/config/terms/Legal_Documents_Download/rating_system_doc_nov_2011/Jan2012_Cert_Policy_Manual.pdf) for more on the rating system Sunset policy. Additionally, if many aspects of the design of the subsequent project(s) are not yet firmly established, it may not be appropriate to include them in the Master Site calculations or LEED Campus Boundary. This is not a specific time limit, but would vary based upon which campus credits are being attempted and how unanticipated changes to the future project(s) might affect those credits. I would note, however, that it is possible to add/revise campus credits (on a credit-by-credit basis) by using the Appeals process, as explained on page 13 of the AGMBC (https://www.usgbc.org/ShowFile.aspx?DocumentID=10486).