One additional piece of information I am interested in is the handling
of Section G3.1.2.10 Exhaust Air Energy Recovery. In the actual design a
10,000 CFM ERV will be serving all the corridor spaces (9 in total).
This unit will be 100% OA with energy recovery.

Section G3.1.2.10 states that systems over 5,000 CFM require modeling
energy recovery in the baseline. So it would seem I need to model energy
recovery on the PTAC serving the corridor(s). Right? To do this I would
actually be modeling a Packaged Rooftop Unit with the efficiencies of a
PTAC because it's not easy to implement heat recovery on a PTAC in
Energyplus.

The one twist to this is that in the 90.1 2007 Addendum w it states:

G3.1.2.10 Exhaust Air Energy Recovery

...

Exceptions: If any of these exceptions apply, exhaust air

energy recovery shall not be included in the baseline

building design.

...

i. Systems serving dwelling units in multifamily buildings.

The corridor is not a dwelling unit, but it was worth pointing that
addendum note out.

Alan Jackson, LEED AP