Yes, since you were not able to discuss this with them. Usually they want you too bid all listed areas. It is to their advantage as they deem that they should get better pricing with all three bldgs... 'volume dictates pricing.'
If you do not bid it, you may not be considered at all... and will be eliminated from the process.
I know that the bldg is in a bad area... but you should be able to do it... it is only one or two days per week after all, not 7 days/week.