Non-centralised AC for office tower

Tristian and Chris I completely agree, realised this after I had originally posted. We do need to get the 10% saving on each individual building. Given we have a C&S going for a certified only LEED rating that is not planning installing AC or lighting as each unit will be sold as a mini home/office its actually quite hard to achieve. We have got th facade compliant just and adding shading but to get to 10% overall reuction in energy we are now looking at having to add in very low energy lighting to comply. Has anyone any other experince with Core & Shell minimum offices that are part of a larger building that does not plan to install a large centralised HVAC plant? Its not as easy a commericial office building being fitted out with a full AC system like we are more familiar with Julian