How to fix the light leaks in the corner edges? (I have read lot of threads already but nothing is working))

Development Rendering
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For anyone googling this in the future,

What I did:

A pitch black material with 0 specularity, 1 roughness and so forth.

And then, encased my (apartment scene) geometry with with cubes of this material. This reduced light leak in corners considerably. Some is still there, but almost non-noticeably.