That is the working height of the bucket.
The bucket is on the arm that is on the machine so you will always be about 2' to 4' away from something even if you parked up against the wall of the building so you are losing that little bit of distance right away.
Now he is parked about 10' away from the building so it is really about 12' to 14' of height lost as you are reaching over at an angle.
Some lifts like that will only go over to the side from 20' to 35' where going straight up is full length.
My big bucket truck will go up 60' high (bottom of the bucket) but will only go out about 50' to the side because of the height of the platform on the truck (about 5' high) and then going over to the side from the middle of the truck (losing about 2' to 4' there).
My bucket truck weighs 26,820 pounds so there is lots of counter-weight so the arm can go out to the sides, front or back of the truck and not tip over, that is why a lot of manlifts cannot go out to the sides too far, you need lots of counter-weight to keep them from tilting over.
If Tony's manlift was up against the side of the building (usually not possible with landscaping, trees, vehicles, etc... there so you cannot get up close a lot of times) then he could get up close and reach the 5th floor but then you need some articulating (more distance) to move the bucket over the side of the parapet and put the bucket on the roof or a ladder off the bucket so you can climb back in.
Hope this makes sense.