I'm trying to get 2-3 sets of intervals in per week, which means I need to do them mid-week. I could get up really early and do them before work. I could do that. But easier to go out on my lunch break. In this case, my "lunch break" was mid-afternoon, but never mind. After a bit of exploring, I settled on this route up the south side of Queen Anne Hill, which ends not far from my weekend route up the north side of the same hill.
I start at 3rd and Roy, go north a block on 3rd to Valley, then west to Queen Anne Ave. Up Queen Anne Ave. to Prospect St., then spiral up to the top, ending at the water tower.
It's not ideal, because about a third of the route is over 10% grade, which is steeper than I'd like. Also, there's a little bit of downhill where I can't sustain effort. But it's better than anything else I can find right around work, and it's a bit over 100m of climbing in 7 minutes, which is about right.