I live a block down the road from the Microsoft Redmond campus (it used to be 12 blocks, but they metatasized), so I walk by all this each day. But I don't work at Microsoft, so all I have is just sidewalk testimony.
The older Microsoft campus was confined to the east side of highway 520, with dozens and dozens of properties rented and scattered all over Redmond, Bellevue, and other places in the area. Lately they have been building an absolutely HUGE property just across the highway from the old campus, where they will consolidate all that rented office space.
Only 7 new buildings? When I walk by there, I can see at least 14 or 17 structures going up, but I can't tell what will be in them. Some of them are titled buildings number 97, 98, 99, and by that they mean Microsoft Redmond campus literally has that many buildings.
The city of Redmond has a height limit on its buildings. I don't know the exact rules, but no skyscrapers. The Microsoft buildings are all about 4 or 5 very tall stories, so they are forced to sprawl rather than go up. When they dug the hole for it all, it seemed to be about 6-12 blocks on a side. Huge, huge hole for that 4600 car parking garage. Then they put up more of those big construction cranes than I've ever seen in such a small space - at one point they had 9 or 10 of them.
With that huge parking garage right next to the highway, they should have just let Microsoft have highway entrances directly out onto 520 and keep all that traffic off the local streets. That would make perfect sense to me. But it exits out onto NE 40th Street, which is a relatively small cross-street, which has relatively small entrance and exits to 520.
There is already a bridge across 520 between the Microsoft campuses - the NE 40th overpass and intersection with 520. Also, Microsoft has a huge fleet of hundreds of shuttle buses and cars that transfer people from point to point in the Microsoft sprawl. My reaction as a local to the idea of a car and pedestrian bridge for Microsoft is that, while it would be beneficial to the locals to keep some of the terrible Microsoft drivers off the local streets (a lot of them are from India!), Microsoft should foot the entire bill.