Central Chillers/Boilers Plant vs. Rooftop Packaged Units

[FCIBSE]

Project: typical low rise(3 storeies high)multi-buildings campus type project, total area is about 80,000 sq. ft.
Has anybody made a study about when should we use a central plant or the popular packaged units for this type of buildings. Any criterias or guidelines besides the client's requirement of easy to maintain and less initial cost?

 

[TBP]

"...easy to maintain, and less initial cost". They're in trouble right there. It's rare indeed to get both of those requirements to come together in any project, or individual component.