These are very much round numbers and it depends a little exactly what you count as Ottawa.
We have some 300,000 ways mapped as buildings, 280,000 have addr: house numbers and street names. I think the majority have been imported. Nominatim will find buildings that do not have a street name associated with them but unfortunately I think finds the nearest street to the building which isn't always the correct one so its better with a street name even if it does fill up the database. building=yes is 50,000 so 83% have been better classified which is good. Some 8,000 have building:levels, these have to be added manually. So shall we say 3% have been mapped by mappers on the ground. Retail 3,000 commercial 4,000 garage 6,000 There were 179 labelled detatched so I corrected them to detached 1600 had a web site. Someone with overpass could probably come up with more accurate figures but to my mind we didn't managed to get as much additional detail on the buildings as I might like. I'm still unsure how a split level building should be mapped. Terraces are sometimes mapped as individual units, sometimes as a block with address information for each unit. Should bungalows be tagged building=detached building:levels=1 or building=bungalow remembering that locally there is a terrace of bungalows. I think the project needs some guidance on these points along the lines of the OSM African highway wiki if the data is to be useful. Cheerio John
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