$19.95; $16.95 (ages 65+); $15.95 (students and military with ID); free (ages 0-14 with adult and to all first Thurs. of the month).
$6 at Westlake Avenue N. garage or $10 all-day at Associated General Contractors building (with validation).
Daily 10-5 (also first Thurs. of the month 5-8). Phone ahead to confirm schedule.