Individual thermal comfort controls

We are working on a LEED 2009 C&S project. The building contains retail spaces on the level -1 and on the ground floor and mezzanine as well, the floors from the +1 to +5 are office floors including private offices, open space, conference rooms etc. Open space offices and private offices will be provided with chilled beams for cooling and floor convectors for heating and room thermostats connected to BMS system. Conference rooms will be provided with chilled beams as well, room thermostats connected to BMS. Fresh air will be provided from air handling units working with 100% fresh air. LEED requires that minimum of 50% building users have comfort controls. My question is: in case of private offices where there are for example 4 desks, is one thermostat (which controls chilled beams and convectors in the room) per room is sufficient to meet the credit requirements? How to calculate this? Does it mean that we have individaual comfort control for 100% of the occupants of this room? What in case of open space office, where there are thermostats provided per group of chilled beams. For example if there are 50 desks and 25 thermostats, is the credit requirement met? We are also confused regarding retail spaces. There will be installed fan coil units for cooling and heating and thermostats. Shall we document for LEED thermostats for the retail workers or for the customers also? How to calculate the number of thermostats for retail spaces? Please give us an advice as the Reference Guide does not give a clear example.