The Underline will transform the underutilized land below Miami’s MetroRail, from the Miami River to Dadeland South Station, into a 10-mile linear park, world-class urban trail and living art destination.

The 10-mile linear park, a $120 million redevelopment of open space under a span of Metrorail tracks roughly parallel to the north end of the Miami River, will link the condos, coworking spaces, and tech offices of the booming Brickell neighborhood with South Miami, in a bid to be a catalyst ...