The house was actually torn down and a new one has been constructed, so once Google updates SV the Tanner House will disappear.
TV Locations, No Longer There, Buildings - Misc
Update: So it finally happened. Google updated the SV imagery, the Alf house is gone forever. I'll keep the map though, so people get an idea of where the house was located. The adress is/was: 708 Moreno Avenue, Brentwood, Los Angeles.