Sam Grant, an admired organizer who has long-championed the cause of affordable housing, announced on Wednesday his resignation as executive director of the Community Land Trust of West Marin (CLAM). Grant, who intends to continue his duties through the end of this month before moving with his wife and young daughter to Minneapolis, described the departure as bittersweet. “I leave with a great appreciation for the challenges of affordable housing development in West Marin and for the presence of a capable board and strong membership base to carry forth,” he said. Since taking on the position in June of 2010, Grant has led the completion of the Blue House Project, in Point Reyes Station, and helped acquire the Mesa Apartments. He has also been a staunch supporter for the development of an affordable eco-village at the Inverness Valley Inn, which has yet to be realized but is moving forward. In describing his departure, Grant said he has enjoyed the friends he has made and times he has had in West Marin, but that his family could not afford the expense of the Bay Area. “We’re really sinking out here financially.” He said CLAM’s current program assistant, Bonnie Guttman, will continue on in her staff role while the board hires a new executive director.