The penalties for non-compliance with the ADA vary depending on the situation. Generally, the Department of Justice (DOJ) will issue a warning letter to the property owner or operator, and if the issue is not resolved within a certain period of time, the DOJ may file a lawsuit. In addition, the DOJ may impose civil penalties of up to $75,000 for the first violation and up to $150,000 for subsequent violations. The DOJ may also require the property owner or operator to pay the attorney's fees of the person or organization that filed the complaint.
Source: www.multifamily.loans/apartment-finance-blog/what-are-the-ada-requirements-for-multifamily-properties