Hello, there.

Here's a question about a game I had last Saturday.

My friend with Prometheus (12 speed with Phasing/Teleport) moved him from the top of a building to the top of another building. Can a non flying figure with Phasing do that?

According to the rule, a Phasing figure can't end its movement in a blocking terrain (i.e. a building).

Thanks in advance.

PHASING
(optional): Give this character a power action. Move this character a number of squares up to its speed value. Ignore the effects of all characters and terrain features, including elevation, on movement. This character may not end its move in blocking terrain

As long as he doesn't stop in Blocking he can go wherever.

a building isn't blocking terrain, it's elevated terrain