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It is not 100% accurate that a person can rent a house to whom every they want. It is against the Fair Housing Act to discriminate against a person based on race, color, ethnicity, gender, nationality, age, etc...
These cases are not easy to prove but with this situation the facts could be reported to the Attorney General: http://www.mass.gov/ago/consumer-resources/your-rights/civil-rights/housing/housing-discrimination.html
In addition, the questionable ethics of the Realtor can be reported to the Consumer Affairs and Business Regulation: http://www.mass.gov/ocabr/licensee/dpl-boards/re/
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