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How were you able to move in if you cannot use stairs and live on a garden level or floor 2+?
If you live on the first floor, what do you need with the elevator?
Either way, consult an attorney if you feel that some reasonable questions need to be answered.
1. Are you renting or buying?
2. We're you similarly disabled at the time you first took occupancy or looked at the unit?
Whether you're renting or buying makes a difference. If you're renting and we're not disabled at the time you first viewed or took occupancy then the landlord might have to make accommodations to move you to one of the units of like type when they come available. If you were disabled at the time you took occupancy and a significant time has lapsed without you bringing the condition to the attention of the landlord then you may run into problems. If you own or are considering buying then the expense to modify the property could rest solely with you. I cannot answer a legal question, only an attorney in this state can do that.
There are alot of resources available to lend assistance to disabled individuals to make living at home possible. It may be time to seek out civic organizations, a house of worship you participate in, your doctor and healthcare system, local government groups etc. to see what if any solutions can be worked out. Approach the problem diplomatically, it could take some time. I have seen amazing works done to help those in need.
Good luck and let us know how you're making out