Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Please see here from Tips and Tricks for Using EnergyPlus.
I suggest to use external dimensions, in order to take into account a sort of thermal bridging effect.
About empty spaces along the main hallway it up to the degree of accuracy you want to pursue. Basically you can put them a half in a zone and a half in the other (or the while in the hallway if not conditioned)
