Ironically, the pictures of one of the #wepark offices in the article was literally directly in front of empty commercial real estate for lease. What does this stunt prove, aside from being slightly silly? Should all the buildings be expanded by ~6',and the sidewalk moved directly adjacent to the road? Because even if personal automobiles are entirely eliminated, roads will still be necessary for access. As a tounge-in-cheek protest against high prices it works, but I think the grandparent is making a more salient point than the wepark group. If your job can be done from a temporary office environment (and many of the people interviewed already worked from their homes) then a far better solution to expensive real estate is to move, especially if you are already working remotely.

How much space can actually be reclaimed from on-street parking in a feasible manner? Likely not enough to make a significant difference in the price of real-estate.