[ By Sam's metric, this is gonna be simple--so easy that he'd never have suggested it to Nathan, who undoubtedly figured it out on his own. They're halfway there already, once she gets up there and he scrambles up next to her.

Back in the garden proper, there's a good-sized wall keeping people from falling to their deaths, for obvious reasons. Up here, the wall's no longer chest-height--for Sam, anyway--but below their feet, and it's easy to see a chunk of the city at large. Some of the buildings are taller than this one, but plenty are around the same height. ]

See that garden? Right over there. [ Believe it or not, it's the building nearest them, the space between the two eminently jumpable (at least by Sam's metric). It's a little across, a little down, from where they are, and it's clearly fancier than the building Sam lives in, if not by a huge amount. Jump from this metal casing to the cement wall across the way, scramble over it, and you're in with bigger, slightly wilder-looking plants, huge blooming flowers that spend all day soaking up the summer sun. ] Gotta live there to get access to it. Unless you got a different way in.

[ And as long as you don't worry about how far down the ground is, doing this stuff is easy. ]

You wanna give it a try?