Thanks, David.
I was in the same position as you when I was a Dean. I found two things to be helpful. Once per week or so, I would work from home a few hours before coming into the school. I found that I could do more in those two hours than I could in three or four at the school because there were no interruptions.
I also blocked out time on my calendar for important projects. That way, I had "an appointment" and was unavailabe.
I always made sure someone was available to work with students who needed immediate… >>>