A broker is more than just a space finder. The broker you choose must have the experience, knowledge and contacts within the sub-market you are considering and be able to work on your behalf.
A good broker is like any other service professional. You should expect your broker to represent your interests, provide good advice and help you through the many phases of the leasing or purchase process. This includes, but is not limited to, helping you determine how much space you need, what are your most important selection criteria, and then finding and negotiating for the space that best meets your needs.