Teens/College age kids: Advice needed

I (53M) may be heading towards a separation/divorce and could use advice on handling older kids. We’ve got a high schooler, one in college, and one who just graduated and is back home with us while looking for a full time job.

I would definitely want 50/50 custody for the high schooler. I’d love the oldest to split time with me, but it feels weird telling him, an adult for practical purposes, he has to pack up and switch houses every week. At the same time, it would be even weirder for his brother to come over and him not to. Same for the college kid who would be home for summer and breaks.

I’m also stuck on potential housing. I’m going to need at least a 3-bedroom apartment (or rental house if I can find one in this market) so I can accommodate all of them, aren’t I?

Have any of you gone through it at this stage of life? Any advice on what worked for you or what you wish you’d have done differently?

Thanks!