Pechanga, already one of the most sizable casino resorts in the area, is doubling its hotel capacity to 1,090 rooms, which will make it the biggest casino hotel in California. Harrah’s Resort Southern California and Barona Resort & Casino are completing more modest expansions. Viejas Casino & Resort and Sycuan Casino are also significantly adding to its facilities, with new hotel towers, pools, restaurants and other amenities in multimillion-dollar projects. Pechanga is one of five area casinos undergoing an expansion.