Unable to answer "What kind of building is this?" for way/930532684 via StreetComplete 45.1:

Privately-owned general hall/sports gym - though it's not used as such. Has stage.

There are (at least) two mailboxes here, marked 1-17 and 2-17. I'm not sure how they divide up.

via StreetComplete 45.1

Unable to answer "What’s the house number of this building?" for way/267606131 via StreetComplete 45.2:

I asked at one of the two stores and they didn't know, and showed that on Google Maps it's 9/11. That seems unusual as it usually means "unit 9, lot 11"; 9-11 ("spans lots 9 and 11") would make more sense.

Unable to answer "What’s the surface here?" for way/785802044 via StreetComplete 44.1:

This path is inaccessible from Atherton end, a large bush blocks what is likely access to a property.