The Brookfield Fire Department reports it sent units to a fire at the Eastbrook Office Park Sunday morning just before 3:00 a-m. Crews arriving on the scene say flames were shooting through the roof as they pulled up.  Before the fire was knocked down, more than one dozen area fire departments had responded.  The Wisconsin Fire Marshal is handling the case.  The buildings appear to have been unoccupied when the massive fire broke out and no injuries were reported.  Firefighters say the biggest challenge was preventing the flames from spreading to nearby buildings.