You would still need to keep the stoplights on the major intersections, the one ways crossings may require reduced parking on the corners to allow for more visibility for bikers and possible long term bump outs for bikers to have even more safety. 35W freeway crossing would need a bridge in the long term yes, for the short term could be routed to 26th. Just use the bridge sidewalks and narrow car lanes enough to add jersey barriers. The hospital would only require a particle tunnel as there is an existing pathway under the parking ramp. Short term could be routed down to 28th, & Andersen until funds can be secured for a hospital tunnel & building out the Stewart Park bike greenway trail. Then finally pending a redevelopment a connection can be tied into the existing bridge over Hiawatha, but for the short term greenway could be routed down Longfellow to 28th.Things a 27th greenway would have to somehow cross: 10 arterial streets w/o stoplights (Hennepin, Lyndale, Blaisdell, Nicollet, 1st, Park, Portland, Chicago, Bloomington, Cedar), two freeways without bridges (35W and Hiawatha), three superblocks 27th doesn't go through (Wells Fargo, Abbott Northwestern, the industrial area at Hiawatha), and a superblock park (Stewart).
Would be kinda messy for the short term but 20 years from now it would be far better than having east and west bike lanes that would be about 1,350 ft. apart. ...thats one big U turn