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Richard Linderman AIA
Principal
The Linderman Group Architects, Inc.
Media PA
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Despicable as a windowless apartment sounds, the ICC codes permit this -- provided the building meets the exceptions in SECTION 1029 EMERGENCY ESCAPE AND RESCUE of the IBC, and meets mechanical ventilation in accordance with the International Mechanical Code as permitted by SECTION 1203 VENTILATION 1203.1 of the IBC.
That said, a windowless apartment might not be that bad if privacy or security is an issue, or if the surrounds are particularly noisy and unattractive. If an apartment in such surroundings had windows, chances are the tenants would always have their drapes drawn anyway.