Greg,
We do quite a few condo complexes with a boom lift here at the Lake of the Ozarks. We put $1 per linear foot per story into our pricing template and it generally comes out so high even we gasp. The guys then sit down and discuss how to attack the project and estimate the amount of time it'll take them. We go back to the pricing template and play with it until we're fairly certain that we're getting paid fairly for the job and the customer thinks they're not being soaked.
We also consideration whether we clean wood in addition to siding. Generally that warrants the full $1 per linear foot per story, but I also stress in the bid letter that requires extra effort and is included. We also squeegee all unscreened windows for that price. Often the building manager says it's not necessary, but we learned early on that it's a lot easier to do that than to deal with spots and not happy apartment and condo dwellers.
We do a couple of buildings every spring that I charge 80 cents per linear foot per story, include rinsing the wood and squeegeeing the windows. On top of that I add the actual cost of the lift. We always make very good money on that project.
We finished a 23 building (4 stories each), 11 18-stall garages and a clubhouse project about 2 weeks ago. I charged only about 30 cents (yup...30 cents) per linear foot per story and we still made $104 per hour for a 3 man crew.
Hope this helps.
Laurie