The Kansas City Area Transportation Authority, which has been working on its first transit-oriented development project in the River Market, is considering two more that would make major impacts on Downtown and a key stretch of 18th Street.

Robbie Makinen, CEO of the KCATA, said the authority is preparing to seek mixed-use, transit-oriented development proposals for its headquarters site at 1200 E. 18th St. and vacant ground it owns across Forest Avenue to the west.

Meanwhile, the authority also…