Bryan,
I ask them if the building allows contractor's parking, if not it will be the cleaning cost + our cost of parking. (I don't specify an exact price. If it is close by, it is just the cost I pay to park. If I have to go a few times around the block and spend time finding it, it will be more.)
Here's my cost structure and what I email:
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In general, the cost for cleaning up to 300 square feet of synthetic carpeting (measured wall to wall-our minimum charge) or 30 stairs is:  [FONT=&]$184.00[/FONT][FONT=&]- If it is the 1[SUP]st[/SUP], or second floor and if we can use a truck mount unit (be able to legally[/FONT] park right by your place).  Third floor or more than 150 feet of hose- $234.00. If we have to use a portable machine (takes a lot longer) - $284.00 + our cost of parking (if free parking is not available.) 
  ·         [FONT=&]A[/FONT]ny additional footage, thereafter, costs 45 cents per square foot (portable machine- 50 cents). Normal width stairs (approximately 30” wide) are  $5.00 per stair. The best cleaning is done with a truck mounted unit, for which we’ll need to be able to park in front of your place (or block your driveway) and be able to hook up to a faucet. 
  ·         Wool and woven carpets are charged at a higher rate.
And no matter how much extra I charge for these Down Town highrises, I still make less per hour.
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