Fire damaged a building on 3rd and Cascade in downtown Hood River Tuesday morning.  The fire in the first floor of the building at 15 3rd Street was reported around 7:50 a.m.  Dave Smith of the Hood River Fire Department says crews arrived to find heavy smoke coming out of the building, and it appears to have started in a back room but was contained to the first floor and did not extend to the second floor or the basement.  He said a business on the first floor is heavily damaged, but structurally the fire did not get into much of the floor system or ceiling.  No one was injured in the fire.  Smith says an investigator from the Oregon State Fire Marshal’s Office is being brought in to determine the cause of the fire.  Crews from Hood River, Westside, Wy’east, Cascade Locks, Mosier, and Mid-Columbia Fire and Rescue responded to the fire.