How do you express your feelings without ruining a friendship?

So there’s a guy I have caught feelings for. I’m not sure if he feels the same … I’ve been moved out of the department I used to work in alongside him to next door, I miss him and also have feelings for him. We have never exchanged numbers or anything, how do I express how I feel without ruining our friendship?
How do you express your feelings without ruining a friendship?
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