Hello,
I'm guessing that you'll need to add a "building" tag to https://www.openstreetmap.org/way/95708858 as well.  In the online editor, if you scroll down at the left you can expand the "tags" that OSM uses (these are calculated based on what you typed in at the top left).
If you add "building" with a value of "yes" it'll appear as a building.
I'm not sure how other "places where boats are maintained" are added in OpenStreetMap - maybe find another one and then use "?" to query what is actually tagged there.
Best Regards,
Andy