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Out front there's a pit drain thing that has a bunch of pipes going to it IIRC.
It doesn't look like sewage waste so I think it's just waste water from sinks and stuff. I assumed the sewage went elsewhere otherwise the multi-pipe pit thing would be full of shit and reek.
I might send the prettier half to ask upstairs and/or email the management dudes to see if anyone has mentioned anything else.
Might try and have a look at the drain outside myself too.
hippy-
Get Bruce on the job
https://youtu.be/Ib-Xwuo2uss?si=eGCMaytFnaHSWsWB
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Is the ground floor of the block of flats below street level? Reason I ask is that I had an issue with our second floor flat. Kitchen sink would not drain. After much anguish we discovered that the block's drains emptied to a sewage tank from where the contents were linked up to the main sewer which is at street level. The pump had failed and the pump alarm also failed so nobody was any the wiser. How it took a second floor first to raise the issue and not someone on the ground floor noticing it first is beyond me.
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Most will be combined (foul and greywater) once it's out front and under a manhole cover. The chambers themselves are not full of shit and don't stink bad. Shit should be passing through, along with water. If you can take the cover off easily enough it should become pretty obvious what's leading to it if you wait a few min for someone to use the loo.
user69121
superbagneres
hoefla
Worth asking the other flats if they have slow draining toilets still.
If the blockage is in a shared part of the system (further down) then at least its not just your problem to deal with. Although I would assume that any kind of root ingress/collapsed pipe/ small blockage issue on a high usage pipe (shared building etc) would surface a pretty obvious problem and become a serious blockage pretty quickly.
Can you lift the inspection cover and take a look out front?