Changes to the association documents may have occurred at an annual meeting where you were not present, or they were in the association documents when you purchased the unit and did not realized the impact of these restrictions.
You can check with an attorney that handles condo association law and see if you have any rights to file a complaint. You will have to speak with the board of directors possibly through the management company.
Brock Realty Inc
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I'm not sure if an attorney can help, but I will pass along info of a real estate attorney to her. I would think it would help if you had anything from RealManage in writing with rental approval.