The city of Chicago must face a lawsuit accusing it of failing to ensure there are enough affordable rental units available to low-income people with disabilities.In a written opinion, U.S. District Judge Robert M. Dow Jr. declined to throw out the suit that Access Living of Metropolitan Chicago Inc. filed against the city.Access Living maintains the city is violating Title II of the Americans with Disabilities Act, Section 504 of the Rehabilitation Act and the Fair Housing Act — Dow referred to them collectively as …