A Courtyard by Marriott is coming to Schenectady, paving the way for development at the former Alco site — now called Mohawk Harbor— where a second hotel is also on tap. Rotterdam developer Galesi Group is partnering with BBL Hospitality of Albany and Kansas City-based Rockgate Hospitality Group to build and operate a 124-room Courtyard by Marriott with a $15 million price tag. “With this project, we open up 60 acres of waterfront property for new development,” said David Bui