They might meet code ...
The natural ventilation requirements may have met code through mechanical ventilation at the time the buildings were built as an option to natural ventilation.
The main thing is that EACH door needs to be large enough to still meet the egress width requirements, must meet the safety glass requirements, must meet the wind load and impact requirements for the building - too much information has not been provided to make any other determinations.
Were the replacement of the doors permitted? Part of the permit for the other work being done there? Inspected? I recommend checking on permits and inspections and ask the inspector who was there as they can tell a lot more from seeing it than can be described here.
Make sure that there are no egress or accessibility obstacles created by the new doors. There are attorneys who go around with people in wheelchairs looking for buildings which do not meet the accessibility requirements - you find that out when you receive a letter inviting you to appear ('demanding' you appear is more accurate) before the judge, when the judge asks if these conditions exist, about your only response is 'Yes, Your Honor, how much should I write the check out for?' The handicap person does not benefit from the law suit (they do not receive any monetary award), but you have to pay the attorneys fees, which will likely be $10,000 to $15,000 (the attorney then pays 'his field assistant' in the wheel chair) and they go on to the next property for the next law suit and the next check.