To access the forms below, you will need Adobe Acrobat Reader. All companies doing business within the City of Los Angeles need to obtain a Business Tax Registration Certificate from the city.It's easy to do online. To form an LP in California, go to bizfileOnline.sos.ca. Use a California business purchase agreement to record the sale of a business. Download your free template today. 1.1. Sale of Property. The Business License Program (BLP) is regulatory in nature; it is not a tax calculated on the gross receipts of a business. Register a Business, Who Can File, Filing Options, There are options available for you to file your Fictitious Business Name Statement. Los Angeles County: 12400 Imperial Hwy.