Wisconsin Institute For Medical Research
1111 Highland Ave, Madison, Wisconsin
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Directions: Floors 3 for sure has two restrooms near the staircase, other floors above that are likely similar. If you take the elevator, make sure to select your floor with the touchscreens in the area. They'll indicate which elevator you should get in. Once you get off the elevator, take a left and go down to the end of the hall. The stairs entrance is right next to the two restrooms. Very clean!
Comments: The building is full of research labs and meeting rooms, so make sure to be quiets. Otherwise, the halls are relatively deserted.