I turned around and went back, but it turned out to have said "Ronald McDonald House, right on Gould." Bummer. I ended up running 7:07 pace, 2:24:30 for 20.3 miles. I felt fine the rest of the day.
Tuesday morning I headed to the north and went five miles out and five miles back, with a few hills thrown in there. I ran 7:00 pace on the way out and 6:00 on the way back.