Parking minimums service a minority of the population of Seattle, while adding 15% to 20% onto the average rental price. Another angle is the road network in Belltown is well beyond capacity, and is likely to only have safety and pedestrian/biker friendliness improvements done moving forward (if not a road diet or car ban), so how do you intend to service these empty spaces so they can be usable?

There isn't more land to build roads on, and tunneling for roadways is extremely expensive and prone to delays (eg. SR 99 tunnel), esp. compared to our rail tunnels which have been repeatedly completed ahead of schedule and under budget.