if I remember right, the 12 comes from NE portland and runs down to the bus mall. from there, you can walk down to jefferson (like a block from where it's going to stop) and then walk down to 3rd (about 2 blocks)... or, you can take the 12 to Hollywood TC and catch the max down to Pioneer Courthouse Square, walk to Jefferson (again, a block or so) then walk to 3rd. Either way, it's about 5 blocks.... it's just a matter if you want to ride the 12 all the way in, or take the max.