Bookselling is not generally a high-margin business, and a decline in foot traffic due to parking, construction, etc. can make a huge difference - that's what happened to The Stars Our Destination, a SF bookstore in Chicago that closed more than a decade ago. Parking on the side streets became sticker-only and restricted to residents, which meant that it was difficult for people to get to "destination" stores. I know from personal experience that it was easy to waste a half hour or more just driving around the area looking for a parking space.