Classic American steakhouse with modern touches The classic American steakhouse is redefined at EST. Prime Steakhouse. Here, traditional favorites meet Southern California's Asian and Latin American influences. Our chefs are dedicated to sourcing the finest local, organic and sustainable ingredients to create a world-class dining experience in the heart of the San Gabriel Valley. From the 35-day dry aged Kansas City steak paired with Salvadorian Chiltepe Chimichurri sauce to the Japanese Kobe beef filet to the luxurious Ultimate Seafood Tower, every dish invites guests to reimagine what they expect from a steakhouse.