How do I know which real estate company is best?

There are a lot of real estate businesses in the phone book. How do I know which is best? I dont have time to contact them all & research them? Are there any "big" companies (that would be in a lot of states) that people have had good business with, that can recommend that certain real estate company as... show more There are a lot of real estate businesses in the phone book. How do I know which is best? I dont have time to contact them all & research them? Are there any "big" companies (that would be in a lot of states) that people have had good business with, that can recommend that certain real estate company as being the most reliable & best overall? Thank you!
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