Running the risk of repeating the previous posts': Unless this is a 24/7 mall they likely will require off hours. I did two mall stores last year and I had to bid for not only the off hours (11:00 pm/7:00 Am) but being a small company i had to compincate for lost time for the next day due to sleep time.As for comparing resedential qoutes to commercial quotes they are gennerally night and day.Commercial specs. are more precise; conduit size, wire size, circuit labeling, extra spare j/b's for future use exc. And they hold you to it.
It is nearly impossble to quote a commercial job, without specs. as opposed to a residential job were you atleast know
beforehand the material requirements.And as stated earlier, if you have to drill concrete make sure the x-raying has been done,the last thing you want to do is hit a stress cable.I have been there and done that...