REDMOND, OR -- The cause of a fire early yesterday morning that damaged the partially constructed Hampton Inn on Highway 97 in Redmond is still under investigation. Fire Marshal Clara Butler says the third and fourth floors on the east side of the building were heavily engulfed in flames when crews arrived, and says no sprinklers were turned on. No one was hurt. Butler says a heating unit on the roof is compromised and fire crews can not safely remove it at this time. When they can eremove it she says it may shed more light on the cause of the fire. Damage estimates are up around half a million dollars.