Early in this process, an examination of the proposed arena site in SoDo was done through google maps and scale overlays of other, existing arenas. The zoom feature and dimensions bar in Google Maps was used to scale pictures appropriately, but it was an imprecise methodology. With the recent KeyArena proposals and continued submissions of SoDo arena documents, we have some professionally sourced dimensions available in public documents and can revisit the SoDo site size compared to what’s available at KeyArena.
KeyArena Size (Roof = 408 x 408 ft)
The AEG/Seattle Partners sketches include dimensions of the roof of KeyArena (“83% of the existing 166,400 square feet of roof area is being maintained”), which reduces to 408 linear feet on each side if we assume a simple 2D square. The exterior dimensions of KeyArena could be smaller if AEG calculated square feet along the inclined roof surface.
SoDo Arena Size (357 x 515 (W end) or 695 ft (E end))
In the SoDo arena, we have street vacation requests that include surveys of the area. The rough dimensions of Hansen’s arena footprint is on land that is 398 ft by ~680 / 710 ft. The SoDo proposal (big pdf) constructs a 32.8 ft wide access road on the East side of the site and has a 8.4 ft setback from the 100 ft width of 1st Ave S, which leaves a SoDo arena building that’s 356.8 ft wide. The land has quite a bit more space in the North-South direction, which is used to construct the NBA team’s practice facility on a four-level parking garage on the Northeast corner. There is also a section of S Massachusetts St that gets included in the street vacation.
Ultimately, this confirms that the KeyArena site was not too small for an arena, even a modern arena, when you get a little more space outside the old roofline. The OVG proposal for KeyArena includes an atrium area and parking garage built off the South end of KeyArena. The Seattle Partners/AEG proposal involves underground excavation, the south end of the roof being extended, and the whole seating bowl being adjusted so it no longer sits centered under the apex of the KeyArena roof.