How does one define under which rating system the master site should be registered?

We have a 220.000 m2 built area Master Site. At this moment, two office buildings in the site will be LEED-CS certified. Total built area of the office buildings is 30.000 m2. Rest of the Master Site consists of residential space. We have defined the Master Site to be a CS registration as well because we want to do the precertification application for the Master Site as well.

Or is there some other rule to follow?