Unable to answer "What’s the house number of this building?" – Residential Building – way/1167545617 via StreetComplete 60.0:

Has this really a house number?

Seems to be plenty of buildings missing, according to Singapore OneMap layer

- redraw stairs
- draw wheelchair slope

via StreetComplete 59.2

Main Carparking

Stairs
32

via StreetComplete 57.3

Stairs

via StreetComplete 57.3

Ramp

via StreetComplete 57.3

Footpath

via StreetComplete 57.3

There seems to be a big problem in this border area with using names not as names, but as tagging for the renderer, and also not actually setting the meta-data that should really be used for the information.

Please see: osm.wiki/Names#Name_is_the_name_only , osm.wiki/Tagging_for_the_renderer and the discussion at https://forum.openstreetmap.org/viewtopic.php?id=60390

For example, putting "(Buses)" in a road is usually wrong and will never stop routers from sending cars down that lane. Naming a causeway "Causeway" is also wrong. Either it has a full name, or it should not be named at all.

Bicycles are permitted to use the causeway