The Marin Community Foundation has discontinued plans to help fund affordable housing on George Lucas' Grady Ranch. David Briggs

Visions of a large affordable housing complex at Grady Ranch dimmed this week when the Marin Community Foundation announced it ended a partnership with filmmaker George Lucas due to uncertain funding.

The plans sprung up in May 2012 after Mr. Lucas ended a decades-long battle to build a major digital-production facility at the site. They would have helped . . .