My personal database of "no longer standing" spots just hit 1000 locations and I'm thinking it might be reaching a point where others could start to find it useful. (I hope there isn't any problem with posting this...I know I'm not supposed to expose location information, but technically these don't exist anymore!)
https://www.google..._dvk&usp=sharing
The area this portion of my database covers is exclusively York Region, so if you're not interested in this region then you probably won't have any interest in this data. Otherwise feel free to download it and add it to your own map!
The map/database doesn't include any pictures or detailed information on the properties, but simply the type of structure (best guess; "barn" applies to basically any large out-building) and when it was demolished, give or take a few years. The locations are pretty darn accurate - mostly within a couple of meters, but the database isn't even remotely close to being complete for the area...some areas I haven't even touched yet (fuck Vaughan, in particular), and some areas such as newly gentrified neighbourhoods are heavily dotted even though they aren't particularly interesting for most explorers.
I find it can be pretty useful for assessing properties on the fly where the Google Maps view doesn't show enough detail or is out of date, and also just generally saving me the heartache of wondering what I missed and by how much. I don't know about the rest of you, but I find it particularly painful passing by a property that obviously used to have something there and not knowing anything about it. This project was my attempt at resolving that issue, but perhaps someone can find their own uses for this information.
And while I realize the UER acts as a Demo DB itself, I'm also kind of curious if anyone else keeps a similar personal database?