Existing building constructions with new data center

Hello, I am going to be modeling an existing building for 2009 NC and we are adding a large data center to an interior space on the top floor of this building. In following the Appendix G guidelines, I have made all of the constructions in my baseline model mimic the existing building. However, this new data center portion was not previously there and the extremely high loads are being transferred to other adjacent spaces and throwing other systems way out of whack. How would you handle these baseline interior constructions (walls/floors) specifically in the spaces surrounding the new data center? Thanks, Ross