We're hearing that Mad River (126 Chestnut) will be taking over the Grape Street (4100 Main) which abruptly closed over the weekend, with owners firing the staff. According to a MySpace bulletin, issued by the Grape Street "The owner and the management made the decision last week. The reasons for the closing were not based on lack of business or profitability but rather a larger tenant coming in and occupying the space the Grape Street currently resides." We're told that Mad River will take over the spot's lease in September and it's unclear whether it will be another version of the popular Old City spot, or a different concept. Mad River reps have not returned requests for comment.