I frequently park at 515 Euclid and the ugly doors in question have been there since I started parking there in 2016. You used to be able to enter the garage through what is now the the Beacon lobby on the Euclid side. It does seem like after the official opening they are going to finish up the front. The stair situation is VERY stupid. They added the stairwell next to the elevators when they built the Beacon (understandably), but neglected to put any clear signage to direct people to the actual garage staircase which is outside of the elevator lobbies completely.