BROOKLYN - Residents at a Brooklyn building were forced to evacuate Sunday night.Fire officials told residents at 475 Kent Ave. in Williamsburg that their building is unsafe. Officials said the building is zoned for commercial use and that the sprinkler system is broken.About 150 people were forced to leave the building. The American Red Cross said most of the residents were able to find a place to stay for the night.Residents told News 12 Brooklyn that they have lived in the building for decades and haven't had any problems.