When traveling to San Francisco, the first concern is often the hotel costs. It's already an expensive city, and accommodation prices can be quite high.

However, for first-time visitors, the Union Square area is a popular choice due to its convenient transportation and proximity to many attractions.

Just a few blocks from Union Square, there is an incredibly large hotel: the Hilton San Francisco Union Square.

It boasts a total of 1,921 rooms. According to tourism board data, it is confirmed to have 1,921 rooms, and it is currently introduced as the largest hotel in California.

The building is also tall, reaching up to 46 floors. If you book a high-floor room, you can enjoy a stunning view of downtown San Francisco. On the 46th floor, there is a sky bar called Cityscape, which is said to be the highest sky bar in San Francisco, offering a 360-degree view of the city and the bay, making it worth a visit even if you're not staying at the hotel.

There is one correction to make regarding the original content. The Hilton San Francisco Financial District is not the second tower of this hotel. It is a separate Hilton hotel located near Chinatown. Therefore, the room counts of the two hotels should not be combined to calculate the size of Hilton Union Square. The room count for Hilton Union Square itself is 1,921.

The reason this hotel is large is not just because of the number of rooms. The event space exceeds approximately 134,000 square feet.

The largest ballroom is about 30,000 square feet and can accommodate large events for around 2,000 people. Thus, it is more of a typical large urban hotel used by corporate meetings, exhibitions, and conference attendees rather than just a hotel for tourists.

The location is also quite good. The address is 333 O'Farrell Street, and you can easily access Union Square and the cable cars on foot.

From here, it's easy to move to Chinatown or shopping areas, and if you go a bit further down, you can reach the Moscone Center, a major convention facility in San Francisco. This location is a significant advantage for those traveling in San Francisco without renting a car.

The hotel features an outdoor heated pool, a fitness center of about 2,800 square feet available 24 hours, restaurants, bars, and business facilities. There are also many options for rooms, ranging from standard king rooms to double bed rooms, high-floor view rooms, balcony rooms, junior suites, and penthouses.

So, how much can you expect to pay for a stay? As of August 2026, the prices displayed on the official Hilton search show that for non-refundable rates for Hilton Honors members, prices start around $170 per night for bookings within the next 30 days.

Depending on the date, prices can drop to the $160 range. However, hotel prices in San Francisco can vary significantly based on the date. On days with major conventions or events, Fridays and Saturdays, and during peak tourist seasons, the same room can become much more expensive. Additionally, considering taxes and parking fees, the actual amount you pay is likely to be higher than the initial room price.

Hilton Honors is Hilton's free membership program, which allows you to access member rates or earn points when you stay. If you travel frequently in the U.S., it might be a good idea to sign up for a hotel membership like this.

Nearby, there are also hotels like the Westin St. Francis and JW Marriott, and the Hilton-affiliated Parc 55 is close by as well. Notably, the Westin St. Francis is also a quite large hotel with 1,195 rooms.

If you're visiting San Francisco for the first time, I believe it's better to prioritize location over just finding the cheapest hotel. This is especially true if you plan to get around without a rental car. In that sense, Hilton Union Square is best understood as a representative large hotel in downtown San Francisco, with many rooms, a good location, and decent facilities, rather than a flashy, modern boutique hotel.