Imaris
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You just revealed everything at once.
I remembered this.
Do his friends live/used to live on the 4th floor? Relatives? Acquaintances? Pets?
Does this matter?
Does he go up to the 4th floor alone?
Does this matter?
With things that are not related to his work?
Does this matter?
Does he go up alone from the 4th to the 7th floor?
Does this matter?
With things that are not related to his work?
Does this matter?
In the evening, does the elevator go up to the 7th floor at all, or only to the 4th?
Does this matter?
Is the apartment on the 7th floor, where he goes, his own?
Does this matter?
Maybe he goes there to water flowers for acquaintances, feed dogs, vacuum, etc.
Added after 49 seconds
Does anyone else live in the building (besides him)?
Many?