Assume you mean private office. Isn't that a pretty compelling argument that the majority don't see big advantages to open plan?

That's a one time cost. Amortize that out over a 5 year office lease and it is peanuts compared to the productivity gains and lower turnover.

Also once you go with a private or semi private office you won't want to go back. Any employee from there interviewing at places with open offices will probably think how much they will hate it there.

I know the occasional person will pop up with the "I love hearing other people jibber jabber throughout the day!" But 9 out of 10 people I talk with would rather not.