An investigation is now underway after a two-story building east of downtown Reno caught fire early this morning. The structure fire in the area of E. 4th and Spokane streets was first reported around 3 a.m. When crews arrived the vacant home was already fully engulfed in flames. Crews were able to knock it down quickly after arrived, but say the building is a total loss. The fire is believed to be intentional and investigators are looking for an arson suspect.