Google says floating barge for showing off new tech

What's the cost of prime shop space in SF with no directly adjacent neighbors and a supreme view of the SF bay?

What's the cost to purchase an old barge, construct a building on made partially with shipping containers, then the cost of docking it permanently. They could even add onto the store by having 2 barges side by side.

Plus, they can easily move it to another dock whenever they want. So they could actually have the same store open in one city for a week, then drag the barge somewhere else. It would almost be like an event, "Hey, the Google Barge is in town this week, lets stop by and play with some robots and other cool stuff!"