"This is long gone"
The place has gone or never existed. A CoMaps user reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2025-07-13T12:01:25Z
POI name: Sir John Cass Hall
POI types: amenity-arts_centre
#CoMaps android

There is a path through here

via StreetComplete_ee 61.1

Attached photo(s):
https://streetcomplete.app/p/293451.jpg

Unable to answer "What’s the house number of this building?" – Semi-Detached House – osm.org/way/1346373730 via StreetComplete_ee 61.1:

These houses are separate

Unable to answer "What’s the house number of this building?" – Semi-Detached House – osm.org/way/1346373732 via StreetComplete_ee 61.1:

These houses are separate

Unable to answer "What are the pickup times of this collection box?" – PL26 58 (Mail Drop Box) – osm.org/node/435678253 via StreetComplete_ee 61.1:

Can't find, either in completely wrong place on map or has been removed

This path does not exist

via StreetComplete_ee 61.1

There is a path through here. And a cat :)

via StreetComplete_ee 61.1

Attached photo(s):
https://streetcomplete.app/p/289927.jpg

These buildings are detached

via StreetComplete_ee 61.1

There is a house here

via StreetComplete_ee 61.1

Unable to answer "What’s the house number of this building?" – House – osm.org/way/1367333903 via StreetComplete_ee 61.1:

No house number visible on survey and the numbering scheme on the end here is wild, import from other source needed