Use 'brokerage' to refer to the business that facilitates the buying and selling process. The brokerage handled all the paperwork for the sale of my house.
Pro Tip 2/3
Industry Specific
Brokerage can specify the type of industry, like stocks, real estate, or insurance. He's looking for a job at a real estate brokerage.
Pro Tip 3/3
Not a Broker
'Brokerage' refers to the business, not an individual broker. She works for a brokerage, not as an independent broker.