Neighborhood groups demanding every residential development has parking for every unit is the reason we can't have nice things.
The spot's a 5 minute walk from an El stop and about 7 minutes to a trolley line. Underground parking is too expensive for projects like this, and requiring a surface lot creates, well, an ugly cityscape destroying surface lot. If the developer provides parking, then it will attract people who have cars, increasing local traffic and congestion. If the developer doesn't provide parking, it'll be relatively more attractive to people who don't own cars. Sure some car owners will move in and compete with existing on street spots, perhaps a small price to pay for one fewer empty building.