South Miami commissioners voted against an affordable housing complex for seniors across the street from City Hall Tuesday. Now the developer says he will file a federal lawsuit against the city. Beneficial Communities, a for-profit developer from Sarasota, was planning on building Metro South Senior Apartments at 6101 Sunset Dr. The company depends on government reimbursements to fund construction for low-rent apartment projects. The developer is accusing the city of violating the federal American with Disabilities Act (ADA) and the Fair Housing Act (FHA). The ADA, established in 1990, prohibits discrimination on the basis of disability, and the FHA, a 1968 civil rights law, prohibits arbitrary restrictions on groups such as seniors. The developer also plans to file a complaint with the U.S. Department of Housing and Urban Department and will ask the U.S. Department of Justice to initiate an investigation.