As the buses leave I-5 and enter Seattle proper, it becomes readily appearant how bad it really is.
The cars are the first indicator. There are signs of wrecks everywhere. Numerous cars drove into buildings. Even more hit other cars, causing some truly huge pile-ups. Some even seemed to have rolled down the hills and into the water.
That being said... the buses seem to follow a particular path, and it has been cleared of obstructions. Perhaps a crew like the one you saw previously has been at work in the city?
The hordes are out, and are drawn to the sounds of the buses. The drivers refuse to stop, and more than a couple of people are simply driven over. Passengers notice and point out small plumes of smoke rising between buildings at random intervals.
Eventually, the buses arrive at the Seattle Center. The Center House -- or, The Armory -- has been hastily barricaded. Chain link panels provide a place for buses to unload, with a number of people standing guard. You all can see a number of bodies laying on the walkways and grass around the grounds.
[ +- ] The Armory, Main Floor
This is the main floor, inside. It's a bit hard to convey, but the facility is pretty large. There is a second floor, which, when I was a kid, used to be different shops but I believe now is mostly offices. You can see the windows, they look down on the main floor. There's also a sort of back hallway on the main floor.
Then there is a lower floor that's roughly as large as the main floor. The one picture shows the "cut out" on the main floor that lets you look down.
All in all, it's like 20,000 square feet and handles 3,500 people "standard." (I don't think that includes office space, either.)
As people unload from the buses, more guards move to watch the parking area, including some on the roof. Inside the doors there are tables, and people are indeed collecting phones, tablets, laptops, and the like. As you get closer, you can see they are putting devices in clear "ziploc" style bags with polaroid pictures of the owner, as well as writing on the bag.
For now, your bus isn't letting people off... it looks like they're taking one bus at a time.