The issue for Americans with Disabilities Act purposes is whether or not you can perform the essential functions of the job, given reasonable accommodations -- offset against whether or not the employer will suffer an undue hardship if it must provide those accommodations (i.e., the accommodations required are unreasonable).
You have the choice of accepting the new position and simultaneously filing a charge with the Department of Fair Employment and Housing (DFEH). If you accept, you may want to provide a letter stating that your acceptance of the position is in no way implied as a waiver of your rights to seek legal recourse for unlawful discrimination.
The reason for this position is that the employer could argue that offering you the new job is actually a waiver of your right to sue, because otherwise, the employer would not have offered you the new job.
To file an unlawful discrimination charge, see this link
Hope this helps.
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