The architects for this casino were the Steelman Partners of Las Vegas, NV, providing interior and lighting design.

On November 1, 2012, construction began on a $160-million expansion that included a new 403-room hotel tower and a 23,000 square foot convention center, which can be converted for meetings, concerts, and other uses.

The project also consisted of many other expansions, including a renovation of the pool area featuring a lazy river and swim-up bar, a food court comprising Earl of Sandwich and the reopening of Pink's (now Smashburger), a Starbucks location, Corked (featuring regional premium craft beers), Spiked, and Rita's (an indoor/outdoor Mexican restaurant).

The land on which Harrah's Resort Southern California[7][8] sits was officially and unanimously renamed by the Rincon Band of Luiseño Mission Indians[9][10] to Funner on August 1, 2016, with the public unveiling of this change occurring on May 5, 2017.

Together with the Tribal Council, Harrah's Resort Southern California management stands firmly committed to promoting "Fun" as the underlying operation guide for business practices.

[citation needed] The Rincon tribe and Harrah's management have appointed a "mayor of Funner", who is a notable celebrity, to promote the resort.