Commercial real estate investment and services company Cassidy Turley Inc. is opening its first Los Angeles office today and has hired away four brokers from Transwestern’s downtown office to do so.

The St. Louis-based real estate company employs about 3,500 people in more than 60 offices nationwide with clients including JP Morgan Chase & Co. and H&R Block.

Former Transwestern Executive Managing Director Jonathan Larsen will head the new Cassidy office, which is slated to open April 30 in the Bank of America Plaza at 333 S. Hope St. Suzanne Lee, Eric Moore and Katie Bernhisel, all formerly of Transwestern, will join Larsen in the new office.

Mark Burkhart, Cassidy Turley’s chief executive, said the company intends to expand with several more brokers in the downtown office as well as new offices across Los Angeles and Orange counties in the next year.

Transwestern has not yet announced any successors