Thursday at noon, at least once a month (slightly more frequent on weekends), a library employee will take public (maxed at 10) up to the 5th floor to gaze down at the eco-roof through glass windows. No access to the roof other than for the maintenance personnel, which is a disappointment. Our amicable guide, in a typical Portland manner (a stretch of green hair, ear rings, tattoos, casually but choosily dressed, trim, soft spoken) said he has never seen anyone out on the roof, ever since the green trays were put in in 2008. I did see the HVAC system on roof and the earthquake reinforcement bar against the balustrade.