City Council Speaker Christine Quinn yesterday warned one of New York’s biggest developers that its $15 billion plan for the West Side Rail Yards must include more affordable housing to win approval.

“We will expect a guarantee of a minimum number of permanent affordable units,” Quinn said at a hearing on a proposed zoning change for the 13-acre site, where a football stadium was once planned.

Related Companies outbid rivals to develop a complex of housing, office towers, hotels, shops and parks on the MTA-owned rail yards on 10th Avenue.

Related has said about 8 percent of its proposed 5,000 housing units will be considered affordable.