How much time is he going to be with his children once he moves out?
Our kids are S18 (away at college), D16, and D11. We are really talking about the 11 year old here. H originally proposed that we share 50/50 with her spending a week with dad, a week with mom. I said I wouldn't go an entire week without her, and that I didn't see how his schedule would allow that anyway, as he travels and has a lot of business dinners, doesn't get home from the office until 7:30 or 8:00pm on a good day. I proposed dinner one night a week (not an overnight), and every other weekend at his place, which didn't include Sunday night, just Friday and Saturday. He said I made a good point and agreed to my proposal. I was pretty taken aback by that, I was expecting some push back, but didn't say anything. If we are all (both parents and kids) are handling things well, then his overnights can be increased as we go along. I'd rather start off skewed towards time with me and be able to release it as I see how my kids react than have to fight to get it back.
We both realize that D16 needs to be handled differently, she's old enough to make her own choices. That's where the concept of his "free" weekends came in, he didn't want D16 to visit on the opposite weekends of D11 because then he wouldn't have as much free time. Boo hoo.
S18, being of legal age, is under no obligation to see either one of us, but he still has a bedroom at our home, he won't have his own space at H's new place, it's a 3-bedroom.