Entrance vestibules and stairs

Hi could someone please help with an answer to the above? I will re-copy for ease. Thank you.

Do vestibules at the entrance of buildings require mechanical ventilation? As those spaces have lots of air exchange with the outdoors when people enter or leave the building, it seems to me that ventilation is not necessary.

Second question:
Do interior stairs require ventilation? Should we consider stairs as corridors?

I know spaces not intended for common use do not need ventilation. There are however, some stairs that are called emergency stairs but used daily.

Any opinions?

Vestibules and egress stairs are generally not considered "occupiable" spaces under ASHRAE 62, and therefore would not require ventilation.  However, if you want people to actually use the stair, adding ventilation would make it a more attractive option. 

Would the LEED project get any credit for ventilated Vestibules and egress stairs?

Get credit? You mean an extra point?  If the stairs were ventilated as part of a comprehensive "active design" strategy, I imagine it may be eligible for an innovation credit.  There is a credit in the innovation catalog called "Design for Active Occupants" https://www.usgbc.org/node/10592095?return=/credits/new-construction/v20...

Certainly!! Thank Christopher. Our project totally qualifies for this credit.