Hotel Information

Reserve Now! Hilton San Francisco Union Square 

The Hilton San Francisco Union Square is expected to sell out early, please plan on making your reservation early to lock in the negotiated room rate.

ACI Hotel Block

Hotel Block Information

The Hilton San Francisco Union Square is the official hotel for the ACI Concrete Convention. All convention events will take place at the Hilton San Francisco Union Square.

The ACI hotel block is expected to sell out early. Reserve your hotel room online at the Hilton San Francisco Union Square. Reservations can also be made over the phone by calling +1.888.446.6677 and referencing the American Concrete Institute.

The ACI group rates are available until March 8, 2023, subject to room availability. The $275 rate is based on a standard single or double occupancy run of house room. The room rate may increase if you select an upgraded room option. All reservations must be guaranteed with a major credit card. You may cancel your reservation up to 72 hours prior to check-in without penalty. After 72 hours, one night's room and tax will be charged.

During your stay, you may be contacted at:

Hilton San Francisco Union Square, 333 O'Farrell St, San Francisco, CA 94102
Phone: +1.415.771.1400

Check in: 3:00 pm PST | Check out: 11:00 am PST

Cancellation Policy

You may cancel your reservation at the Hilton San Francisco Union Square up to 72 hours prior to arrival without penalty. After 72 hours, one night's room and tax will be charged.

Reservation Problems

Please contact Carole Berrelez at carole.berrelez@concrete.org or +1.248.848.3186 if you have any difficulty making a reservation or would like to be added to the wait list for a room at ACI’s official hotel.

Hotel Piracy

Please note: Should you receive a phone call or email requesting you make your hotel reservation or upgrade your reservation through an outside party (or a party saying they represent the hotel) for a different rate, please do not comply and contact ACI Event Services at +1.248.848.3795 to report this. 

Accessible Rooms

To reserve an accessible hotel room, please call each hotel directly and reference the American Concrete Institute.

Government Rooms

ACI has a limited number of government rate hotel rooms at the Hilton San Francisco Union Square. You may book your government rate room at the Hilton San Francisco Union Square by clicking here. All government rate rooms must be booked using the reservation link. If you are unable to make a government rate room reservation, please contact Carole Berrelez at carole.berrelez@concrete.org or +1.248.848.3186 for further assistance.