Thousands of people have lost homes in LA and displaced victims say they are facing sky-high rental prices and hotel fees.
Oppenheim said his business was offering its services for free and had received dozens of calls from people who had lost homes.
Speaking on BBC One's Sunday with Laura Kuenssberg programme, he described sending a client to visit a property where the landlord had previously been asking for $13,000 per month in rent.
"[My client] offered $20,000 a month and he offered to pay six months upfront and the landlord said 'I want $23,000'," he said.
"There are price gouging laws in California, they're just being ignored right now, and this isn't the time to be taking advantage of situations."