We went to the San Jose main library (also the library for San Jose State U.). The elevators were out, but there was no sign. So after the crowd swelled to a dozen, I started up the stairs. Six floors, the first double-height. I wish I could say it didn't knacker me. But I managed it, and when I hit the button for a down elevator, up ones started arriving and disgorging crowds of people, then a down one came. So at least I didn't have to take the stairs down.
The first two upper floors (the public library part) are also fed by an escalator. That was where the housemate was headed before the same floor as me, but she said the second escalator was also out, so she did the same upstairs hike.