Maybe I’m not reading this properly but I can’t seem to follow what you’re writing about.

You need a period after lift.
“He smelt like a hospital” sounds a little funny with the word smelt, so maybe you could say something like “He reeked of cigarettes, sweat, and the odor of a hospital”

I know it’s hard to space out things because it takes up characters but it’ll help the story run smoother if things are kind of separated from one another. It’s like two different thoughts.

I may be being too harsh because this is a mystery but I guess I don’t get anything that happened with her boss trying to kill her with a knife and a cleaning guy wanting to sleep with her.

I like the idea of it, but it comes off a little unclear. Maybe if you took some things out it would make things run a little smoother?

This piece can really be something if you tweak it a bit. :)