Last year we asked many of our friends and clients this question. We enjoyed learning more about how they work together, and how to expand our network at the same time. The most frequent comments: our best collaborators are fun to work with, they challenge us, and simply bring out our best!
One of our 2016 highlights included the completion of Symphony Park. We had an on-going collaboration for 7 years with their Friends Group, East Fenway neighborhood, Boston Parks Department, Nitsch Engineering, SGH Engineering, Thompson Engineering, and Kulin Modern.
For more thoughts on this topic, check out this article: Getting Your Stars to Collaborate by Heidi K. Gardner (Harvard Business Review, January-February 2017 issue)