This is a duplicate question. You can speak to legal aid for assistance in completing the paperwork. You could also speak with an attorney who represents tenants and handles discrimination cases in housing. Since there are generally attorney's fees attached to these types of cases attorneys are willing to take them on for the guarantee of fees if you prevail.
Best of luck.
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Without doing any research into your issue, I am suspecting that the person who denied you housing violated a number of rules and possibly the Americans with Disabilities Act. Yes, you should contact a lawyer to discuss your options.
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As I agreed in your identical question, yes you definitely need an attorney familiar with the ADA
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