Individual buildings is definitely preferable to interpolation ways. For adding address coverage in Fargo, ND, I used the 'audio mapping' technique detailed on the wiki while riding my bike up one sidewalk and then down the other on each street. It goes very fast and works very well. I also gather building:levels data at the same time as well as whether the address is for a house or apartment building. So my audio recording sounds like...
"Number 102 is a 1 storey house, number 104 is a 2 storey apartment, etc..." Hope this helps. -AndrewBuck
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