Thank you for your question. I look forward to working with you to provide you the information you are seeking.
Under the Americans with Disabilities Act and the Fair Housing Act, they cannot discriminate against you based on your disability. Refusing to provide you a reasonable accommodated unit for your disability or charging you more could possibly be a violation of the ADA, but it would only be so if you can prove they are not charging everyone who wants a ground unit more money. If as a standard price ground units are more than other units to everyone, then it is not discriminatory.
I truly aim to please you as a customer, but please keep in mind that I do not know what you already know or don't know, or with what you need help, unless you tell me. Please consider that I am answering the question or question that is posed in your posting based upon my reading of your post and sometimes misunderstandings can occur. If I did not answer the question you thought you were asking, please respond with the specific question you wanted answered.
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Also remember, sometimes the law does not support what we want it to support, but that is not the fault of the person answering the question, so please be courteous.