This link may help http://www.ehow.com/list_6306996_mic...uirements.html
Here's the last paragraph:
Habitable spaces in a basement or below the fourth floor of the building are not required to be equipped with egress windows or emergency escape when the area is equipped with an approved automatic sprinkler system that acts as a safety device in the event of a fire. An additional exception is granted when habitable spaces are designed with an exit door that opens directly to a public area, allowing for an alternate escape route.
Read more: Michigan Basement Egress Window Requirements | eHow.com http://www.ehow.com/list_6306996_mic...#ixzz2MOQDYnCH