the adjacent building, two droideka destroyer droids, one standing on the lip of the balcony and firing down into the street, and the other firing towards the staircase.

were there windows on the other balcony ?

so its a move action: to go out to the balcony edge, then jump the 10ft across .. . right

acrobatics/athletics +2 < presumed for jumping
probably would use a force point as well

the question is can I toss my grenade as I land at the droids feet, and get through a possible window on the otherside ?