The Cleveland housing market is experiencing a disaster of nearly biblical proportions. Last year, more than 13,000 foreclosure cases were filed in Cuyahoga County, which includes the greater Cleveland area. In response, the County Commissioners assembled the Cuyahoga County Land Bank, a non-profit organization dedicated to acquiring and restoring vacant properties into productive parts of the community. Last month the land bank took a leap forward by forging a unique agreement with mortgage giant Fannie Mae that could be a game-changer for the distressed Cleveland region — and a model for other communities hit hard by the foreclosure crisis nationwide.