“I have this friend …”

Ok, continue eye roll…setting the scene a 3 story apt complex.
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He lives on the bottom floor in the middle of this row of apts facing into the parking lot…and she lives on the end of the apt on the second floor with her balcony facing into the dead end parking lot … So it’s a good 30-40 yards between the two.
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It’s random times when he sees her, when he does she and him are smoking cigs…he wants to approach her the problem he has his ex gf living with him she has a tendency to get jealous rather easily…I keep pressuring him to kick her out, he says it’s a nice set up, she cleans, and does his laundry(that’s another discussion for later).
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Anyway each time he sees her, his ex is there or he’s on the phone with work, or running late to work, always a more pressing issue getting in the way…idk if they make any sort of eye contact or any other clues that might be helpful…
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He wants to write a note and leave it at her door, or throw it up on to the balcony…what kind of advice should I give him…I told him to tell work hold on(while on the phone, the ex to f-off they aren’t together, and to apologize to work for being late.) But he won’t shut up about this girl…so I need some help to shut him up.