It seems logical that no M&V plan would be required for Case 1 as you state above. However, the reference guide (page 187) appears to clearly call for it in both cases. Our project is well below 75% of the building area, and is both submetered and the tenant pays their own utilities. I've looked over the IPMVP requirements and it seems that the only reasonable compliance path you could follow in this case, without extensive equipment monitoring devices or a complex whole-building energy simulation, would be Option C (using a similar building or buildings as a baseline). It would be great to avoid this requirment altogether, since the IPMVP readily acknowledges this method is fraught with inaccuracy. However, when I check "Case 1" on LEED online, it still asks for an M&V plan to be uploaded. Some clarification as to whether or not it really is required would be very helpful; this credit could represent as much as 10% of our project's points.