Yep. The company I work for (75-100 employees) is currently split between two offices, literally across the street from each other. Development, product, and QA

Yep. The company I work for (75-100 employees) is currently split between two offices, literally across the street from each other. Development, product, and QA are in one office, while sales, marketing, retention, accounting, and founders are in the other. Even though we are literally across the street from each other, and even though we are together with like co-workers and departments, we've felt the same issue you've described here. This is because we have grown lately and expanding our physical space has been... a complicated procedure. I'll be glad when we've moved into a single office again, which should happen by the end of the year.