First of all I have to say that I have been blessed with excellent colleagues over the years. We see the students as all of ours and the students know that the adults will support each other.
For many reasons I rarely send a student to the office for misbehavior. I reserve that for more persistent or severe behavior. In the absence of a room dedicated for time outs, I send students to another classroom. This strategy works well for students that just need to be removed from their peers for a bit.
I have several open desks where students from other classrooms can come and work. I know that I can send a student from my classroom to another teacher. I haven't used this form recently, but I created this in the past to better communicate between teachers what is happening with a particular student.
The emphasis is on problem-solving and not punishment. Most of the students sent to my room liked me, they just wanted to see me under better circumstances.