FWIW, good acoustical engineering can make a significant difference in how loud an open-space "feels." Putting sound-absorbing materials on all architectural features and hanging sound-diffusing baffles from the ceiling can change a loud room into a significantly quieter and less distracting room.
It isn't a panacea, but it isn't hard to do. You will need someone experienced in room acoustics to design it for you. I'd still prefer small offices over an open space, but if management is stuck on having an open-space then getting good sound control in there will make the best of a bad situation.
You can hear the reverse in a lot of trendy restaurants nowadays where, for some reason that I can't comprehend, it is fashionable to deliberately make the dining area as loud as possible.
http://www.grubstreet.com/2013/07/adam-platt-on-loud-restaur...