Baltimore came up empty-handed Wednesday when the federal government turned down Maryland's request for $231 million to fund two large transportation projects. The state had been seeking $76.1 million in federal assistance for an Interstate 95 interchange project to spur redevelopment at the 160-acre Port Covington site in South Baltimore where Sagamore Development wants to build a mixed-use project with a new Under Armour corporate campus, housing, retail and more.