I am bidding on walkways around the outside of a 4 story building. The total square footage is 17,920, littered with gum, spread equally over the 4 sides of the 4 stories. We charge anywhere from .05 - .10 $ square foot for flat work but the gum and the logistic nightmare of having to work a huge space spread out so annoyingly has got to cost something. I am looking at 0.15$ sq ft total, which should cover gas, diesel, extension hose to reach up and around the building as well as paying my help. If it was all flat work and the surface was right in front of me as in not spread out over 16 sides of a multi story building it would be a lot cheaper right? Does .15$ sq ft seem like a reasonable rate for such a pain in my behind? If it makes a difference the building is part of a University but its summer so we can work on our own schedule but I am having a hard time deciding how long it will take just because of all the non sense associated with hooking up 50 feet high and working our way down. We can only reach 2 sides of the building at a time so we will have to move the truck to do the opposite side as well...this is our first large job and any input will be appreciated.