Unable to answer "What kind of memorial is this?" for osm.org/node/5906552901 via StreetComplete 53.2:

Is a modern disused caboose a memorial?

These are separate buildings.

via StreetComplete 53.0

Unable to answer "What’s the house number of this building?" for osm.org/way/326665770 via StreetComplete 42.0:

This is part of Student Book Store, to the west.

Unable to answer "What’s the house number of this building?" for osm.org/way/326665786 via StreetComplete 42.0:

This building, and the rest of the area around, it has been replaced by a five-story apartment building.

speed limit is 40 here

Unable to answer "What is the house number of this building?" for osm.org/way/619899157 via StreetComplete 34.0:

No building here.

Unable to answer "What kind of building is this?" for osm.org/way/593552615 via StreetComplete 52.0:

This and the garage are one building, number 116. Seems to be an old store front converted into a detached house.

Attached photo(s):
https://westnordost.de/p/142342.jpg

Unable to answer "What type of shop is this?" for osm.org/way/641096680 via StreetComplete 51.0:

This is a commercial building, containing multiple shops.

Unable to answer "What kind of building is this?" for osm.org/way/677170649 via StreetComplete 49.2:

This is many buildings, they cannot be tagged separately.