A fire broke out at an apparent apartment complex on Hooker Street and Colfax Avenue Friday morning, the Denver Fire Department reported in a post on social media.Firefighters said the residential building appeared abandoned, but one person was inside the building who DFD suspect "started the fire to stay warm." She was taken to the hospital.DFD arrived around 5:12 a.m. Friday. Firefighters got the flames under control within approximately an hour, but DFD said they'd stay on site to monitor for hot spots. However, the fire fight blocked off part of westbound Colfax Avenue, Denver7 Traffic Expert Jayson Luber reported. Federal Boulevard was still open and moving normally, allowing drivers to get past the scene without too much of a delay.The building was once the Liberty House Apartments, according to the Denver Assessors Office.