For M&V you do not need to measure energy use by the suite. You want to measure by energy end uses like lighting, heating, etc. Sounds like you are headed in the right direction just make sure your measurement scheme can account for all of the energy end uses either directly or indirectly.
Exactly how you would measure what, depends upon many factors. I always try to find the least expensive method (permanent sub-meter, spot measurements, short-term trending, etc.) to get the data I need.