If you choose to simulate detached pavilions (as a single facility/building, as discussed here), then make sure to select FullExteriorWithReflections. You (you should nonetheless do a few sanity check runs to ensure mutual self-shading & reflections (i.e. between pavilions) are simulated as expected.enabled correctly).

If instead simulating each building independently (10 buildings == 10 IDFs), then the other buildings would need to be modelled as shading objects (see here and/or here), and yes also select FullExteriorWithReflections.