From I-294:

Take the Willow Road exit, west.
Continue west after Willow Road merges with E. Palatine Road.
Turn south on E. Rand Road.
Enter Atlantis Banquets from E. Thomas Street or from E. Rand Road.

From I-90:

Take the Arlington Heights exit, north.
Turn east on E. Thomas Street.
Enter Atlantis Banquets from E. Thomas Street or from E. Rand Road.

See Google Maps (Note: Google and other maps have this location erroneously marked as north of the E. Thomas Street intersection; the location is actually south of the intersection. You may use the E. Thomas street entrance or the E. Rand Road entrance to enter the lot — whichever is more convenient.)