Food & Fun Food Truck Schedule Special Event Requests Vendor Instructions Texas Union Underground Location Rates Reservations Tower Tours UT Tower 360° Virtual Tour Alienware Longhorn Esports Lounge Hours of operation *See Texas Union Building Hours Exterior entrance to the Union Underground, from Guadalupe and 24th Street. Enter through either door and head downstairs to the first floor (you'll be on the second floor when you enter at street level).